Each night, the Priest may use their holy water on a player. If that player is a lycan, that player will be attacked. Otherwise, the Priest risks their own death.
Details
If the targeted player is a lycan, they are attacked. If they are townsfolk-aligned, the Priest dies. If they are not lycan and not townsfolk-aligned, the target isn't attacked and both the Priest and the target live.
Using holy water on a player is an end-night ability.