rules updates

add dread wurm and werebeasts
fix backlink for magic items
update rules for + abilities

src/assets/fragments/bestiary/werebeast.md

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+-   Humanoid form usually retains some characteristics from their animal form.
+-   While in animal form, immune to mundane, non-silver weapons.
+-   While in animal form, can only speak with animals of that type.
+-   Cannot where armor, as it limits their ability to shapeshift.
+-   May summon 1d2 animals associated with their animal form from the surrounding area.
+    -   Animals arrive in 1d4 rounds.
+-   When hit with wolfsbane, must **Save vs Poison** or flee, as with the [Scare spell](/spells/calm.html#scare).
+-   When killed in animal form, reverts to humanoid form.
+-   Some animals can smell werebeasts, and are afraid of them.
+-   When a humanoid loses more than 1/2 of their max hit points from the natural attacks of a werebeast (ex: bite or claw), they must **Save vs Poison** or become infected with therianthropy.
+
+    -   The disease takes 2d12 days to full infect, with signs of infection appearing halfway through.
+    -   Humanoids become the same type of werebeasts (and typically run by the referee).