Necro Spell Renew Bones
 

Currently the spell damages your pet for 125 points of damage instead of healing it for 125. Haven't checked if it cures poisons/diseases effectiveness yet.

I can confirm this bug, finnaly got the words to make the lvl 29 research only pet heal and it does dmg instead of heals. Hoping this is a quick and easy fix as the lvl 8 heal doesn't cut it at lvl 29+