A cleric can solo even con to yellow Dwell mobs, even though undead mobs are less difficult... but it isn't the quickest approach. Melee them down and use ward, rotate stuns and contravention nukes. Soloing is effective far better that way than using a tank merc and just chain therapeutic https://tysonsenub.livebloggs.com/23092603/the-greatest-guide-to-battle-cleric