Death mechanic you say? I'm loving this topic already!
I have a TON of death mechanics ready in my game and other ideas to kill the player character!
I have mines,
mines that move randomly,
mines that move straight,
mines that follow you,
doors that traps the player with walls that do the squish,
beds that look like resting spots are actually spike traps,
statue traps set to stab the player,
hidden holes that drops the player into spikes,
unstable ice surface in ice puzzles that drops the player to their death,
surprise explosions hidden in fake pokemon treasure boxes,
surprise explosions when the player trips on a line,
surprise explosions when the player tries to help out a pokemon,
pokemon that can cut the player many times to death,
pokemon that can zap the player to death,
pokemon that can burn the player to death,
pokemon that can teleport the player on hot lava,
pokemon that can teleport the player off a cliff,
pokemon that explodes right in the player's face,
pokemon that uses sing and slowly kill the player,
pokemon that immediately kills the player when weakened,
pokemon that hold a gun and shoot the player,
pokemon that can scare the player to death,
pokemon that kills the player after losing in battle,
pokemon that will ambush the player when their shadow is stepped on,
death timer until the player drowns underwater (and icy water),
death timer until the player bleed to death,
death timer until toxic gas is released,
death timer until the floor of lava is raised,
death timer until an avalanche crushes the player,
death timer until the whole place explodes,
death timer until the player freezes to death,
death timer until the player is poisoned to death,
death timer until a plague fully takes control of the player and
death timer until ALL YOUR FRIENDS AND ALLIES ARE MIND CONTROLLED TO KILL THE PLAYER! MWHAHAHAHAHA!
Also, a mix of these, like pokemon chasing or pushing the player into a hole while there's a death timer.