An idea that I've been juggling with for a while is the idea of a healer that mixes "ingredients" together to produce a result. Essentially it would function like Rikku's FFX "Mix" Overdrive combined with NIN mudra. This ability could then be further augmented via abilities to make the concoction AoE or have additional affects.

As AST is kinda RNG, and the other two can get stale, this may be a decent way to have some depth in the role. Let me know what you think, always interested in hearing opinions, whether positive or critical.

Also on the off chance anyone at SE reads this and wants to use any of it, feel free. I claim no ownership to any of the ideas posted here.