Assassin

 The assassin is able to spend 3 coins to assassinate another player. This action can be blocked by the contessa.

Specifics
When a player attempts an assassination on a player, anyone may challenge the assassin claim. If a player correctly challenges them, then the player claiming assassin loses an influence and the player getting assassinated does not. After a correct challenge, the player that claimed assassin will not get their 3 coins they spend on the assassination back. If a player incorrectly challenges the player claiming assassin, then they lose an influence and the player claiming assassin shuffles their assassin back into the court deck and receives a new face-down card to replace it. After an incorrect challenge of an assassin, the player getting assassinated will still have a choice between allowing the assassination or claiming to block with contessa, even if the player getting assassinated was the one who challenged the assassin claim.

If the player that is getting assassinated decides to block with contessa and are correctly challenged, the blocking player loses both of their influence: One for getting assassinated and one for being correctly challenged. If the player that is getting assassinated decides to block with contessa, are incorrectly challenged, and reveals the contessa, then they will shuffle the contessa back into the court deck and draw a new face-down card to replace it. The player who incorrectly challenged them will lose an influence. 

 