rules updates

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

src/pages/magic-items/feathers-of-ferrnym/bird-feather.md

@@ -0,0 +1,23 @@
+---
+title: Feather of the Bird
+description: A magical feather that can summon a gargantuan bird.
+date_pub: 2024-03-17T21:26:57.000-04:00
+section: magic items
+content_type: feature
+short_code: mffb
+---
+
+A small, magical feather that summons a gargantuan bird when tossed into the air.
+
+-   Feather disappears with use.
+
+### Bird
+
+-   Once summoned, the bird:
+    -   Remains for 24 hours before flying away.
+    -   Can be commanded to either:
+        -   Chase away aggressive avian creatures, _OR_
+        -   Transport the character.
+    -   Can fly 160' / round
+    -   Can carry one huge animal (ex: mammoth) or several smaller ones.
+    -   Cannot be commanded to attack.