The Moonstone Crown is a craftable post-Moon Lord rogue accessory that is a direct upgrade to the Feather Crown. While equipped it boosts the velocity of any thrown rogue weapon by 15%. In addition, all thrown rogue projectiles have a 1/300 chance to spawn a moon sigil that deals 20% of the weapon's base damage (softcapped at 75 damage), slightly homes in on enemies, and pierces indefinitely.
If the player utilizes a stealth strike and hits an enemy, several lunar flares will rain down onto that hit enemy. This effect only triggers for the first five enemies hit.