Especially on Island Levels Runemaster Thorn with his lign of sight beam ability seams to be a very powerful weapon!

Are ther any restrictions for the runemaster in SOB?

Thanks for your answers, a desperate Overlord!

There are no restrictions for Thorn in SoB - he might be a key factor if the heros want to stand a chance at all especially in Lt. encounters. In island levels I don´t see him as too powerful. He can speed up these levels quite a bit, though.