[Taqwus]

Storms would work, as would a damage shield (Charcoal Shield for non-mages, Fire Shield for fire mages say) or possibly a damaging aura (e.g. cold from the one cold-radiating armor, or the life draining from bone armor, etc).
Storms will also help prevent the Swarm + Haunted Forest abuse, or at least make it less likely that you're suddenly surrounded by fatigue-causing undead plant beings.