Bark Shell

You take the bark in your hands and use your druid magic to spread the bark around you, creating a shell which you slowly drain the life force from for health. Your AC increases by +2. Each Round, your AC is reduced by -1 and you gain 2d6 HP. This process stops until the AC Bonus is depleted. Casting this spell at slot level 5 will increase your AC by +3. Casting this spell at slot level 7 increases your AC by +4. Casting the spell at slot level 9 will increase your AC by +6.

If your concentration is interrupted, you will lose all bonus AC gained from this spell and take 1d4 of acid damage as the bark melts off of your body.