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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]]") during their set at the [[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> In May 2019, Illenium released a track with [[Jon Bellion]] called "[[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> As of September 2019, both singles maintain Illenium's highest placement on the Hot Dance/Electronic Songs chart at number 3.<ref name="DanceSongs"/>
LaterKemudian inpada MayMei 2019, Illenium anddan Ekali debutedmelakukan adebut collaborativekolaborasi trackpada trek berjudul ("Hard to Say Goodbye") during apada set at the [[Electric Daisy Carnival]] indi [[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> InPada JuneJuni 2019, Illenium announcedmengumumkan thatbahwa hisalbum upcoming albumberikutnya, ''Ascend'', wouldakan bedirilis releasedpada on16 AugustAgustus 16 throughmelalui Astralwerks. HeDia alsojuga announcedmengumumkan atur 30-citykota Northdi AmericanAmerika tourUtara insebagai supportbentuk ofdukungan theuntuk albumalbumnya.<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> OnPada July24 24,Juli 2019, aftersetelah manymelalui monthsbulan-bulan ofpenuh playingpentas atdi festivals, hiskolaborasinya collaboration withdengan The Chainsmokers anddan [[Lennon Stella]] titledberjudul "Takeaway," alongberikut withdengan thevideo officialmusik music videoresminya, weresecara officiallyresmi releaseddirilis.<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> TheVideonya menaThe 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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