You can meet the master wizard and there you can empower your spells with some new currency which is valuable for wizards/mages.
When wizard casts timestop at the time he finds it, his spell is only a few ranges wide. Spell wraps around the sphere of only 2 enemy pawns.
He finds some kind of crystals or defined source of power in the world. Then he goes to master wizard in town or in wizards tower to upgrade his spells.
He can upgarde the damage the spell and ranges, areas of effects. Then his timestiop spell wraps around multiple enemy pawns.