User blog comment:Supafrunk/Concept - Solvo, the Aspect of Creation/@comment-64.136.205.114-20120211191853/@comment-4097756-20120212220054

It sounds complicated but the basic is simple. Out of the 4 kind of stacks, 3 are only there to show you the 3 casted spells in the past. The 4th one is to prevent constant spam.