Selective Explosions (Engineering)
Source
Character Operations Manual pg. 80
If your stunt and strike skill check and attack roll both succeed and your attack is made with a weapon that targets an area (such as a weapon with the automatic, blast, explode, flexible line, or line properties), you can select a number of squares up to your Dexterity modifier and remove them from the affected area.
Dragonscript
ID
a5b72385e91645fb516bb92c