Vanitas' marker is a free standing version of this thing, about as big around as a sun dial— but the stained glass is shattered. The part with Vanitas on it will be visible, though cracked, but the other half where the other boy should be is broken, leaving nothing but shards of multicolored glass behind and a dark hole beneath.

People visiting his grave will have two options, and they'll feel more emotional than physical:

one: The destruction of Vanitas and the x-Blade. Characters witnessing this will feel, at the final blow, like their heart has been literally broken in half (because it has). Following that will be desperation, fear, and a sense of losing everything they've ever wanted. After that will be the sense of falling into darkness— no sight, taste, smell, or hearing. What they will feel is very warm and safe, though. Strange, that...

two (also SPOILERS): Characters will be forced to stand through this conversation while the strength saps out of their body at a steady clip, as though they are bleeding fatally from somewhere they can't see. The sense here is one of finality, as Vanitas really believes he can't be anything more than the darkness, or the villain. It's less a sense of peace at the moment of death and more a sense of the inability to fight fate.

Toward the end of the week getting close to it will be difficult because Vanitas' Unversed will be hanging around the dial and will attack anyone who gets close. They're easy to kill though so feel free to just... do that... they act as a sort of silent alarm, so if they get destroyed he'll pop out of no where to hassle any character still hanging around.