Splinter fires on projectile hit. On a piece that carries it it reads: Every {count}th projectile hit splinters into the 2 nearest other enemies for {value}% of the damage.

Word for word it is Every {count}th projectile hit splinters into the 2 nearest other enemies for {value}% of the damage, and the number in it grows with the gear: 35 to start, 2 more for every item level, and it only goes off every 4 times you set it up.

0 bases carry it.

Awakening can reach it too — 4 spirit paths pick it up at Spirit Level 3: Cinderveil, Rimebolt, Voltweft and Venombolt.