Possessed Weapon

A possessed weapon's maximum hitpoint total is equal to six plus the number of HD that its Unwilling Host possesses. Unlike other weapons, a possessed weapon is immune to the broken condition and cannot be destroyed unless a specific set of conditions are fulfilled. If a possessed weapon's current hitpoint total becomes less than 1, it becomes invulnerable and unstoppable for 1 round and its Unwilling Host becomes dazed for 1 round; after this duration has elapsed, it gains [x] hitpoints and its Unwilling Host loses a number of hitpoints equal to the number of hitpoints that it gained.
[x] is equal to 25% of the possessed weapon's maximum hitpoint total (rounded up)