Parm Aegis

Parm Aegis is a passive item in Vampire Survivors. It was made available for the base game alongside the Ode to Castlevania DLC. It can be found in Ode to Castlevania stage after unlocking Stallion Gate, locates in the dinner room inside the Art Gallery. It can also be obtained by Arma Dio. It never occur as a leveling up options, however.
Parm Aegis increases invulnerability duration after taking damage for 50ms per level.