Grimstone
Complimentary Artifact to True Aim and Thunderstroke
While bow- and crossbow-users have True Aim and Thunderstroke to fuel their ambitions, there is no corresponding artifact missile for our humble sling wielders. Grimstone is intended for halfling archers and other characters who use slings.
When unidentified the weapon appears to be a normal rock, albeit one that weighs 6s instead of 5.
In identified form this missile has the following stats: Grimstone (+0, 10d6). When thrown, kicked or shot from a sling, Grimstone transforms into a huge rock while in the air (complete with the appropriate tile when playing in NotEye), crashing through doors and doing appropriate amounts of damage to creatures it hits. The tile changes back to that of a normal rock when on the ground.
Like other artifact missiles, this weapon returns when fired or thrown, reassuming its smaller size in the player's missile slot if caught. It also grants the character the see invisible intrinsic when in that slot.