|Ancient ogres versed in the eldritch arts have assembled this totem and imbued it with occult power.|
Ogre totems are the opposite of goblin totems - instead of hasting their allies and damaging you, they heal their allies and slow you. If you wouldn't survive being slowed, simply stay out of its LOS.
Since it never regenerates and can't move out of harms' way, try setting it on fire or using a potion of descent on it (possibly even from out of LOS, once you know where it has to be).
| The charming inhabitants of the dungeon: