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I think you're massively over-estimating what mastered abilities do. They give you level 50 abilities at best. Try making a dragon, leveling it to 100. Scribe every single t5 spell. Do not progress...

I can 100% agree with what flamefeniks said.

All the masterable abilities are guranteed to be lvl 50 or lower, so at best you'll be working with a t3 version of a skill fighting t6 mobs... that......