You appear to be a member of an Anti-Town faction present in the game to all alignment checks.
During the night, you may target a player. Assuming no interference with your action, that player will be Inked. If you target an Inked player, they will instead die.
Players who are on an opposing team who are Inked will be roleblocked until the Ink is cleaned off.
Ink is naturally cleaned off after 3 nights.
You win when all threats to the Town have been defeated.