OMFG I think they increased it
The darkwing devilet's Impish Incantations hits you from the rear for 1624 points of damage.
That was on Mara with shell on a 4 star R 30 leve
4 Star used to hit me for much more than that (3K+), so not sure that they increased it. Granted you are a few ranks above me.
Either way, at the risk of being rated down, am I the only one who isn't happy with the nerf? For as many criticisms there are about the battles being too easy, not requiring strategy, etc. (there are several threads on the topic on these very forums), they went ahead and nerfed one of the tougher world/leve mob encounters implemented to date? It's not like it was impossible to do... you can run, shield bash, zerg/focus fire, or do a number of things to avoid the incantations hit.
Quite ironic if the nerf was based on player feedback.