Make Tremor and Flame Blast harder to use
Currently, Flame Blast and Tremor work by firing a blast from the runecaster toward the enemy. They can't be used on an unnavigable tile, and they hurt allies caught in the blast. This means that Flame Blast and Tremor can STILL be used to great effect if their allies give them a wide berth and give enemies a clear path to the runecaster. The runecaster's weak defenses and lack of movement abilities, not to mention all the obstacles in the middle of arenas, has gone a long way to helping runecasters do nothing but cast Bolt of Flame for mediocre damage every turn, but there are still problems to fix. Everyone knows people only play runecasters because they want to be a slower, weaker version of a True Bow, and with just a few simple fixes, you can realize this goal.