Your loyalty to Vecna is so grand that you decide to give up your body to be filled by Vecna's manifestation. This is the highest honor a creature can obtain.

At Vecna's will, he may posses your body for a short time. He has full control of you and has access to all spells, items, and anything else on your person.

When Vecna is finished using you, you must take all responsibility for "your" actions. You must not reveal that Vecna can or has controlled you.

If you reveal any of Vecna's secrets or that he can/has controlled you, you will immediately lose your tongue and lose half you HP permanently.

When Vecna no longer requires your body, you are transformed into a Daywalker.