You can surround yourself with a harmful aura similar to some Blast, or you have sharp spikes and spines all over you, thus dealing indiscriminate damage to anything near you and to anyone who attacks you in close combat; this damage is equal to your Creature powers Action Value, minus their attack outcome. Thus, a poorly executed attack is likely to cause them more harm than it does to you.

Anyone with Damage Immunity to Blast/Unarmed Combat (for Blast/physical effects) or an appropriate element is immune to Elemental Aura. The aura can also be avoided with ranged attacks and creative stunts, but these are left to the player's creativity to come up with.