===2019: Kolaborasi lanjutan dan ''Ascend''===
Pada Januari 2019, Illenium berkolaborasi dengan dua musik elektronik, [[Bahari (band)|Bahari]], untuk trek "[[Crashing (Illenium song)|Crashing]]".<ref name="BBCrashing">{{cite magazine| last=Bein| first=Kat| title=Illenium & Bahari Are Drunk on Love in 'Crashing': Watch| magazine=Billboard| date=January 25, 2019| url=https://www.billboard.com/articles/news/dance/8495022/illenium-bahari-crashing-lyric-video| access-date=July 23, 2019| archive-date=January 26, 2019| archive-url=https://web.archive.org/web/20190126080724/https://www.billboard.com/articles/news/dance/8495022/illenium-bahari-crashing-lyric-video| url-status=live}}</ref> Diikutinya pada bulan Maret 2019, kolaborasi dengan [[Kameron Alexander]] untuk trek "Pray".<ref name="YourPray">{{cite news| last=Meadow| first=Matthew| title=ILLENIUM Drops New Single "Pray" With Kameron Alexander| work=YourEDM| date=March 22, 2019| url=https://www.youredm.com/2019/03/22/illenium-drops-new-single-pray-with-kameron-alexander/| access-date=July 23, 2019| archive-date=August 24, 2022| archive-url=https://web.archive.org/web/20220824184600/https://www.youredm.com/2019/03/22/illenium-drops-new-single-pray-with-kameron-alexander/| url-status=live}}</ref> Pada 31 Maret 2019, duo EDM, The Chainsmokers, debut kolaborasi dengan Illenium untuk ("[[Takeaway (song)|Takeaway]]") pada set mereka di [[Ultra Music Festival]].<ref name="DAChain2019">{{cite news| last=Sweeney| first=Farrell| title=The Chainsmokers surprise with debut of new Illenium collaboration at Ultra Music Festival| work=Dancing Astronaut| date=April 3, 2019| url=https://dancingastronaut.com/2019/04/chainsmokers-surprise-debut-new-collaboration-illenium-ultra-music-festival/| access-date=July 23, 2019| archive-date=May 10, 2019| archive-url=https://web.archive.org/web/20190510042429/https://dancingastronaut.com/2019/04/chainsmokers-surprise-debut-new-collaboration-illenium-ultra-music-festival/| url-status=live}}</ref> Pada Mei 2019, Illenium merilis sebuah trak bersama dengan [[Jon Bellion]] berjudul "[[Good Things Fall Apart]]".<ref name="EDMBellion">{{cite news| last=Cameron| first=John| title=Illenium Shares Release Date and Artwork for "Good Things Fall Apart" ft. Jon Bellion| work=EDM.com| date=May 7, 2019| url=https://edm.com/music-releases/illenium-jon-bellion-release-date| access-date=July 23, 2019| archive-date=May 13, 2019| archive-url=https://web.archive.org/web/20190513150605/https://edm.com/music-releases/illenium-jon-bellion-release-date| url-status=live}}</ref> Hingga September 2019, kedua single menjadi peringkat tertinggi Illenium pada daftar tangga lagu Hot Dance/Electronic Songs di peringkat ke-3.<ref name="DanceSongs"/>
InKemudian Januarypada Mei 2019, Illenium collaborateddan withEkali electronicmelakukan musicdebut duo,kolaborasi [[Baharipada trek berjudul (band"Hard to Say Goodbye")|Bahari]], onpada theset track "[[CrashingElectric (IlleniumDaisy song)|CrashingCarnival]] di [[Las Vegas]]".<ref name="BBCrashingYourEkali">{{cite magazinenews| last=BeinPowell| first=KatKarlie| title=IlleniumWATCH: Ekali & BahariIllenium AreDebut DrunkBeautiful onUnreleased LoveCollab inat 'Crashing':EDC WatchLas Vegas| magazinework=BillboardYourEDM| date=JanuaryMay 2520, 2019| url=https://www.billboardyouredm.com/articles2019/news/dance05/849502220/illenium-bahariekali-crashingedc-lyriclas-videovegas/| access-date=July 23, 2019| archive-date=JanuaryJuly 2624, 2019| archive-url=https://web.archive.org/web/2019012608072420190724061847/https://www.billboardyouredm.com/articles2019/news05/dance/849502220/illenium-bahariekali-crashingedc-lyriclas-videovegas/| url-status=live}}</ref> HePada followedJuni that2019, withIllenium amengumumkan Marchbahwa 2019album collaborationberikutnya, with''Ascend'', [[Kameronakan Alexander]]dirilis onpada the16 trackAgustus "Pray"melalui Astralwerks. Dia juga mengumumkan tur 30-kota di Amerika Utara sebagai bentuk dukungan untuk albumnya.<ref name="YourPrayBBAscend">{{cite newsmagazine| last=MeadowBein| first=MatthewKat| title=ILLENIUMIllenium DropsAnnounces New'Ascend' SingleAlbum "Pray"& WithNorth KameronAmerican AlexanderTour| workmagazine=YourEDMBillboard| date=MarchJune 2213, 2019| url=https://www.youredmbillboard.com/2019articles/03news/dance/228515881/illenium-dropsascend-newalbum-singlenorth-prayamerican-withtour-kameron-alexander/2019| access-date=July 23, 2019| archive-date=AugustJune 2417, 20222019| archive-url=https://web.archive.org/web/2022082418460020190617043850/https://www.youredmbillboard.com/2019articles/03news/dance/228515881/illenium-dropsascend-newalbum-singlenorth-prayamerican-withtour-kameron-alexander/2019| url-status=live}}</ref> OnPada March24 31,Juli 2019, EDMsetelah duo,melalui Thebulan-bulan Chainsmokerspenuh pentas di festivals, debutedkolaborasinya adengan collaborationThe withChainsmokers Illeniumdan ("[[TakeawayLennon (song)|TakeawayStella]] berjudul "Takeaway,") duringberikut theirdengan setvideo atmusik theresminya, [[Ultrasecara Musicresmi Festival]]dirilis.<ref name="DAChain2019">{{citeCite newsmagazine| lasturl=Sweeneyhttp://www.billboard.com/articles/news/dance/8523210/the-chainsmokers-illenium-lennon-stella-takeaway-video| first=Farrell| title=The Chainsmokers, surpriseIllenium with& debutLennon ofStella's new'Takeaway' IlleniumVideo: collaborationWatch|date=July at Ultra24, Music Festival2019| workmagazine=Dancing AstronautBillboard| access-date=April 314, 2020|archive-date=July 24, 2019|archive-url=https://web.archive.org/web/20190724205714/https://www.billboard.com/articles/news/dance/8523210/the-chainsmokers-illenium-lennon-stella-takeaway-video|url-status=live}}</ref> Videonya diputar lebih dari 6 juta tampilan pada 3 hari pertama setelah dirilis. "Takeaway" juga dengan cepat memasuki top 10 di daftar penjualan iTunes Sales Chart di Amerika Serikat.<ref>{{Cite web|url=https://dancingastronautheadlineplanet.com/home/2019/0407/chainsmokers26/why-surprisedont-debutwes-newi-collaborationstill-do-chainsmokers-illenium-ultralennon-musicstellas-festivaltakeaway-reach-top-10-on-us-itunes-sales-chart/|title=Why Don't We's "I Still Do," Chainsmokers, Illenium & Lennon Stella's "Takeaway" Reach Top 10 On US iTunes Sales Chart|date=July 26, 2019|website=Headline Planet|access-date=July 2328, 2019| archive-date=MayJuly 1028, 2019| archive-url=https://web.archive.org/web/2019051004242920190728021138/https://dancingastronautheadlineplanet.com/home/2019/0407/chainsmokers26/why-surprisedont-debutwes-newi-collaborationstill-do-chainsmokers-illenium-ultralennon-musicstellas-festivaltakeaway-reach-top-10-on-us-itunes-sales-chart/| url-status=live}}</ref> InPada May16 Agustus 2019, Illenium releasedmerilis aalbum trackstudio withketiga berjudul ''Ascend'', di Astralwerks. Albumnya terdiri atas 17 trek, termasuk "[[JonTake BellionYou Down (Illenium song)|Take You Down]]", called"Crashing," "Pray," "[[Good Things Fall Apart]]," dan "Takeaway."<ref name="EDMBellionYourAscend">{{cite news| last=CameronMeadow| first=JohnMatthew| title=Illenium SharesBreaks ReleaseBoundaries Date& andReaches ArtworkA forNew "GoodLevel ThingsWith FallThird Album, Apart"Ascend"| ftwork=YourEDM| date=August 16, 2019| url=https://www.youredm.com/2019/08/16/illenium-ascend-review/| Jonaccess-date=August Bellion16, 2019| workarchive-date=EDMAugust 16, 2019| archive-url=https://web.archive.org/web/20190816212019/https://www.youredm.com/2019/08/16/illenium-ascend-review/| url-status=live}}</ref> Menjadi album pertama yang meraih nomor satu pada daftar tangga lagu ''Billboard'' Top Dance/Electronic Albums dan juga meraih peringkat tertinggi pada ''Billboard'' 200 di peringkat ke-14.<ref name="BBAscendCharts">{{cite magazine| last=Murray| first=Gordon| title=Illenium 'Ascends' to His First No. 1 On the Top Dance/Electronic Albums Chart| magazine=Billboard| date=MayAugust 729, 2019| url=https://edmwww.billboard.com/musicarticles/business/chart-releasesbeat/8528699/illenium-jonascend-bellionno-release1-datetop-dance-electronic-albums-chart| access-date=JulySeptember 2326, 2019| archive-date=MayAugust 1329, 2019| archive-url=https://web.archive.org/web/2019051315060520190829204828/https://edmwww.billboard.com/musicarticles/business/chart-releasesbeat/8528699/illenium-jonascend-bellionno-release1-datetop-dance-electronic-albums-chart| url-status=live}}</ref> AsPada of SeptemberDesember 2019, both singles maintain Illenium's highestmasuk placementkedalam ondaftar the[[Forbes Hot30 Dance/ElectronicUnder Songs30|''Forbes'' chart30 atUnder number30]] 32020.<ref name="DanceSongsForbesU30"/>
Later in May 2019, Illenium and Ekali debuted a collaborative track ("Hard to Say Goodbye") during a set at the [[Electric Daisy Carnival]] in [[Las Vegas]].<ref name="YourEkali">{{cite news| last=Powell| first=Karlie| title=WATCH: Ekali & Illenium Debut Beautiful Unreleased Collab at EDC Las Vegas| work=YourEDM| date=May 20, 2019| url=https://www.youredm.com/2019/05/20/illenium-ekali-edc-las-vegas/| access-date=July 23, 2019| archive-date=July 24, 2019| archive-url=https://web.archive.org/web/20190724061847/https://www.youredm.com/2019/05/20/illenium-ekali-edc-las-vegas/| url-status=live}}</ref> In June 2019, Illenium announced that his upcoming album, ''Ascend'', would be released on August 16 through Astralwerks. He also announced a 30-city North American tour in support of the album.<ref name="BBAscend">{{cite magazine| last=Bein| first=Kat| title=Illenium Announces 'Ascend' Album & North American Tour| magazine=Billboard| date=June 13, 2019| url=https://www.billboard.com/articles/news/dance/8515881/illenium-ascend-album-north-american-tour-2019| access-date=July 23, 2019| archive-date=June 17, 2019| archive-url=https://web.archive.org/web/20190617043850/https://www.billboard.com/articles/news/dance/8515881/illenium-ascend-album-north-american-tour-2019| url-status=live}}</ref> On July 24, 2019, after many months of playing at festivals, his collaboration with The Chainsmokers and [[Lennon Stella]] titled "Takeaway," along with the official music video, were officially released.<ref>{{Cite magazine|url=http://www.billboard.com/articles/news/dance/8523210/the-chainsmokers-illenium-lennon-stella-takeaway-video|title=The Chainsmokers, Illenium & Lennon Stella's 'Takeaway' Video: Watch|date=July 24, 2019|magazine=Billboard|access-date=April 14, 2020|archive-date=July 24, 2019|archive-url=https://web.archive.org/web/20190724205714/https://www.billboard.com/articles/news/dance/8523210/the-chainsmokers-illenium-lennon-stella-takeaway-video|url-status=live}}</ref> The video garnered over 6 million views in the first 3 days after its release. "Takeaway" also quickly entered the top 10 on the US iTunes Sales Chart.<ref>{{Cite web|url=https://headlineplanet.com/home/2019/07/26/why-dont-wes-i-still-do-chainsmokers-illenium-lennon-stellas-takeaway-reach-top-10-on-us-itunes-sales-chart/|title=Why Don't We's "I Still Do," Chainsmokers, Illenium & Lennon Stella's "Takeaway" Reach Top 10 On US iTunes Sales Chart|date=July 26, 2019|website=Headline Planet|access-date=July 28, 2019|archive-date=July 28, 2019|archive-url=https://web.archive.org/web/20190728021138/https://headlineplanet.com/home/2019/07/26/why-dont-wes-i-still-do-chainsmokers-illenium-lennon-stellas-takeaway-reach-top-10-on-us-itunes-sales-chart/|url-status=live}}</ref> On August 16, 2019, Illenium released his third studio album, ''Ascend'', on Astralwerks. The album consists of 17 tracks, including the aforementioned "[[Take You Down (Illenium song)|Take You Down]]", "Crashing," "Pray," "Good Things Fall Apart," and "Takeaway."<ref name="YourAscend">{{cite news| last=Meadow| first=Matthew| title=Illenium Breaks Boundaries & Reaches A New Level With Third Album, "Ascend"| work=YourEDM| date=August 16, 2019| url=https://www.youredm.com/2019/08/16/illenium-ascend-review/| access-date=August 16, 2019| archive-date=August 16, 2019| archive-url=https://web.archive.org/web/20190816212019/https://www.youredm.com/2019/08/16/illenium-ascend-review/| url-status=live}}</ref> The album became his first to reach number one on the ''Billboard'' Top Dance/Electronic Albums chart and also reached his highest peak on the ''Billboard'' 200 at number 14.<ref name="BBAscendCharts">{{cite magazine| last=Murray| first=Gordon| title=Illenium 'Ascends' to His First No. 1 On the Top Dance/Electronic Albums Chart| magazine=Billboard| date=August 29, 2019| url=https://www.billboard.com/articles/business/chart-beat/8528699/illenium-ascend-no-1-top-dance-electronic-albums-chart| access-date=September 26, 2019| archive-date=August 29, 2019| archive-url=https://web.archive.org/web/20190829204828/https://www.billboard.com/articles/business/chart-beat/8528699/illenium-ascend-no-1-top-dance-electronic-albums-chart| url-status=live}}</ref> In December 2019, Illenium was named in the [[Forbes 30 Under 30|''Forbes'' 30 Under 30]] 2020 Music list.<ref name="ForbesU30"/>
===2020–2022: ''Fallen Embers''===
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