[2] After listening to a demo tape, Sumerian Records offered the group a contract and Sebastian recruited a full lineup for the band.

[5] On Bad Omens' joint tour with Bring Me the Horizon in 2024, he joined the stage during their show to sing "Antivist" with Oliver Sykes.

[6][7] In January 2024, Bad Omens released the single "V.A.N" in collaboration with singer Poppy; the vocals were performed solely by her.

[8] Sebastian wrote Bad Omens' biggest hit "Just Pretend", which went viral and was certified Platinum by the RIAA, and also directed its music video.

Bad Omens' self-titled album was widely compared to Bring Me the Horizon's Sempiternal, and Sebastian said that in fact the band was one of his biggest inspirations.