Every time you use its power it grows in power. There is a point where your followers will ask or even tell you to stahp, warning you that by using the power you are increasing the tadpoles power.
A similar mechanic was in Elex, I did not play this action RPG (I didn’t like it, terrible controls) but read the walkthroughs. The ending differs depending on how often you use Elex and whether you use it at all.