Double Trouble
You and an ally become a double threat.
Preqrequisite
-Benefit
Once per day after you and an ally strike the same target using the same type of weapon within the same round, automatically apply the critical hit effect of the second weapon to hit to the target and increase any associated save DCs by 2. If the ally who struck the target is your bonded partner, in addition to being subject to the critical hit effects, the target is flat-footed until the end of your next turn.
Source
Interstellar Species pg. 67
Dragonscript
ID
ddf014cf91d628c9b41a6366