Passives:
Evasive - Immune to death at night, as well as most forms of occupation and redirection. Additionally can visit people in jail.
Feast on the Dead - Every time someone dies you gain a spawn.
Day Ability - Stalk (1 Spawn): Your spawn will follow someone, and tell you who they visit each night. If at least three stalked people visit the same target, your spawn will attack that target; the attack cannot be healed and bypasses death immunity.
Day Ability - Plague (1 Spawn) - Poison a player. They will die in two nights if they aren’t healed and have their night immunity byapassed.
Night Ability:
Devour - Select two targets. You will attack the one that less stalked people visit. If there’s a tie, visit your first target.
Some notes - The point of the Giant rat is to amass information about your opponents, avoid people so you don’t get hit by knights, observers. He has poison to kill immunes, and punishes multiple people for visiting a target (I’m looking at you prince). I feel like he needs another night ability, but I can’t think of a good one so I’ll leave it.