Exploitative Strike
Source
Near Space pg. 143
When you use lethal strike, you can force your target to roll its initial save twice and take the worse result. Alternatively, when a target that you studied on your previous turn is within your reach and an ally’s attack results in a critical hit against it, you can activate lethal strike as a reaction.
Dragonscript
ID
41ceb12d19ed258e77b2107b