How To unlock Soma Cruz in the Vampire Survivors Ode to Castlevania DLC

To unlock Soma Cruz in the Vampire Survivors Ode to Castlevania DLC, you must defeat the boss Gergoth while playing as Julius Belmont. Find and open the second coffin hidden behind a wall in the Grand Library of the Ode to Castlevania stage. Start a run using Julius Belmont in the Ode to Castlevania map, head to the downstairs area of the middle building located just below the library and above the Capra Gate.