I agree with the OPs comment.
The class is basically so bad it you can't salvage it. Its a half caster like the Ranger and Paladin but it is useless in normal combat, has a d8 hit dice (but can't skirmish or cast spells that good) and its key ability is triggered off sacrificing spell slots and even then is not that good anyway. The Pathfinder Alchemist runs rings around it. you could give it level 6-9 spell slots with no spell list and it would still be bad.
This is actually a common problem with the EN5ider classes, all of them are mostly terrible with the possible exceptions of 1 noble archetype and the Feywalker. The noble has also been laid out badly but at least it kind of functions at doing something different and can do it OK to do it well. The Morph and Diabolist also look quite bad.
Sorry I tried to be polite Morrus, EN5ider has done a great job with archetypes for example but the classes are very niche and often out right bad to boot.