Metal Splinters is a monster-only spell which blasts you with a cloud of shrapnel, dealing moderate ranged physical damage.
The following monsters cast Metal Splinters:
E Iron elemental- 3d27
D Iron dragon- 3d30
9 war gargoyle- 3d27
Pandemonium lord- in one of their spell sets
In very early, pre-DCSS versions of Crawl, this was a player-castable spell, a L8 Conjurations spell called Throw Splinters. Notably, it was a penetrating bolt, dealt pure physical damage, and bypassed enemy evasion. It was replaced in Crawl 2.7 with Lehudib's Crystal Spear.