You summon an intelligent humanoid skull and may give it one simple task. The skull will continually attempt this task until it is destroyed or the task is completed. If the task is completed the skull magically dissipates. 

Stats:

AC: 15 

HP: 1d6

Dex: 12

Con: 5

Cha: 6

Int: 10 (increases by 1 for each day it exists) 

Wis: 6

Str: 1

Languages: Common, one other shared language