Mark of Nasus

You have been blessed by the touch of Nasus, granting you a mark on the back of your neck that can be activated whenever you are unseen by any other creature, requiring concentration. While active, the mark grants you and all of you equipment a form of undetectability and invincibility. You cannot be seen, heard, or in any way detected by another creature, including by magical means. However, if you speak, your words will be audible. The mark only is deactivated if you choose to reveal yourself or if you make physical contact with another creature, or if you lose concentration.

Any damage taken while under the effects of the mark will not harm you until the mark is deactivated, at which point you will take all stored damage at once.