For starters, great work combining the two invisibility spells of the Ranger spell book.

However, When you cast blend, then do something that pulls you out of invisio, then perceive, you still have the spell on you.

Questions:

1) Should it pulse to re-invisio because it's still "in duration"?
2) Should successive casts of blend be stacking up to infinity? Prep, Cast, Prep, Cast keeps increasing the duration.

Let's start there.

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Player of Diggan, Ranger & Halfing of Aesry