moar updates

src/assets/fragments/magic-items/decapitation.md

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+### Decapitation
+
+On a successful attack, the target may be decapitated.
+
+-   Against a target of stone or metal, a decapitation only occurs on a critical hit (regardless of size).
+-   Against a target of size large or bigger, a decapitation only occurs on a natural 19 or 20.
+-   Against a medium-sized or smaller target, a decapitation occurs on a natural 18, 19, or 20
+-   Some creatures may either be immune to or unaffected by decapitation (ex: creatures without a head, elementals).