I'm just about to start running this adventure and there appears to be missing information from the Githyanki Guardian Shade's stat block (pg. 77). Specifically, one of the Shade's powers is:
Guardian Fury (immediate reaction; at-will) * Force
Burst 2; +23vs. Fortitude; 2d8+4 force damage and the target is pushed 3 squares.
There is no trigger written for this immediate reaction. Does anyone have any ideas about what this should be? My guess is that it is an immediate reaction to melee attack damage, but I would like an official answer if there is one.
Thank in advance.