Dying Light fires on summon expire. On a piece that carries it it reads: A summon that expires bursts for {value}% of your Power at enemies within 2 u of it.

Word for word it is A summon that expires bursts for {value}% of your Power at enemies within 2 u of it, and the number in it grows with the gear: 100 to start, 5 more for every item level.

0 bases carry it.