At a live show on March 30, 2018, the band debuted songs from their forthcoming fourth studio album that will be about "The Deathly Hallows". They later announced that the album would also feature the anti-folk musician Kimya Dawson as a guest vocalist. Parts of this album were recorded in a studio, and others were recorded at the Lawrence, Kansas public library. On April 23, 2019, the band unveiled a Kickstarter to help recoup the cost of recording the album, which they revealed was named "Lumos". Backers could also choose rewards that include an additional album entitled "Mostly Camping", as well as a vinyl single called the "Harry Potter Boogie."