Swain's ravens collect Soul Fragments that heal him and permanently increase his maximum health and scaling with Ability Power.
1
Death's Hand
Swain unleashes several bolts of eldritch power that pierce through enemies. Enemies hit take more damage for each bolt they are struck by.
2
Vision of Empire
Swain opens a demon eye that deals damage and slows enemies. Champions hit are revealed and also grant Swain a Soul Fragment.
3
Nevermove
Swain launches a wave of demonic power forward. It then returns to Swain and roots enemies it hits. Swain can then choose to pull all rooted champions closer.
Ult
Demonic Ascension
Swain transforms into a demon and drains health from nearby enemy champions, minions, and neutral monsters. Swain can cast Demonflare to decimate multiple times and slow nearby enemies with a nova of soulfire. This form is indefinite as long as Swain drains enemy champions.
Ability descriptions from the official Wild Rift website.
This page is for League of Legends: Wild Rift (the mobile game), not League of Legends on PC. A Japanese version with guides and matchup notes is available: 日本語版.