If the Hatter dies and Legion is in play, nothing happens. If the Hatter dies and an evil player chooses Legion, all current evil players become Legion.
If the Mastermind is alive and the Lleech's host dies by execution, the Lleech lives but loses their ability.
If the game ends due to the Alsaahir's ability and no other characters were eliminated: retire the Alsaahir.
If the game ends due to the Saint's ability and no other characters were eliminated: eliminate the Saint.
If Legion is the last character to die due to execution in a game, and loses as a result: Legion is eliminated.
If the Lleech dies to their own ability: eliminate the Lleech but not the character they poisoned on their first night.