Shoot them, multiple times. Assuming they are similar to immortals in other forms of media, they will take some time to come back to life. Take this brief interval of their inactivity to force feed them vast amounts of explosives set on a certain timer, which will explode within them.
Alternatively, I would suggest smothering them in vast amounts of concrete, until they bear more resemblance to a slab of pavement than a human being, and then lobbing them into a black hole.
If none of the above work, I would suggest death by boredom. My primary suggestions would be forcing them to watch either the complete Marvel cinematic universe, the first couple of "Fast and Furious" films, or the latest series of "Doctor Who".
put them in a stupid kids TV show, watch them help the characters fix their minor problems, then they remember that none of those things have any sort of magic in so they can't -walk away
Also, the meme answers are getting a little unoriginal and repetitive--I'm all for you taking a bit of liberty for the humorous side (as this is somewhat intended to go,) creativity is the real kicker here. I may have a reward for my favorite response.
@Bowler218, I am not saying you wouldn't be able to hit Gideon, but if it does, the shot wouldn't work. Not even the god of death was able to kill him, so a mere bullet wouldn't work either.
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For reference it starts with "trump reelected 2020"
Also would mtg memes work
Also, WOTC intended tibalt to be a lot more frietning.
But you are right on the matter of him originally being intended to be much more frightening and threatening.
Alternatively, I would suggest smothering them in vast amounts of concrete, until they bear more resemblance to a slab of pavement than a human being, and then lobbing them into a black hole.
If none of the above work, I would suggest death by boredom. My primary suggestions would be forcing them to watch either the complete Marvel cinematic universe, the first couple of "Fast and Furious" films, or the latest series of "Doctor Who".
If I can't hit Gideon, I'll kill off Jace. I mean, he's Jace, he kind of deserves it.