Well, I don't mind the tranquility thing as it nothing new to throw in a heal cd ( i only play pve)
In my opinion a feral tank (or a kitty jumping in to save tank) with dispersion on a regularly basis is really overpowered!
I didn't get how the symbiosis spell works.
THe druid chooses someone from the team to cast it on.
The teammate gets (in this case tranq) an additional spell.
And the druid gets dispersion and whatever else.
How long do they have the power to use this spell? A few seconds or the whole fight?