Cyclone Armor

This skill allows the Druid to sheath himself in a swirling mass of charged particles that absorbs damage from fire, cold and lightning based attacks.

This shielding spell is essentially an elemental version of the Necromancer's

Bone Armor.

It absorbs a set amount of elemental damage but has no effect against physical attacks

The amount of damage absorbed isn't really big enough to bother with for most bear/wolf Druids though, especially with the enormous amounts of hit points those characters get.