Who is the calamity here!

Tau's power confounds the others in that he has to always fill his potential before leveling up. The filling of potential is not usually necessary to level up. Also, what makes it difficult is that it takes Tau ten times the amount of growth to jump between levels. So for Tau to go directly to the upper limit of blue, he has the power and magic levels of ten blue powered gobos. 

Tau waves his hands. The force is equal to a blue level entity, but his stamina and magic reserve is much larger. Even his pet feels stronger already and she is still his soul-space.