Regroup
From Worlds of Carnage
Regroup is a spell taught by the Lord of Cimmura (up to 80%). He is only accessible after completing the first half of the Angorn quest. The quest starts at the Jailer inside Angorn.
Regroup is also on a tome (specifically for the last 20%). The tome is in the western side of Fal-Darak (high-level area) carried by Artos.