Martyr's Morningstar

Martyr's Morningstar +2 is given by Dosia if presenting her the Blackthorn Bark Cure in The Uncommon Cold side quest in Baldur's Gate chapter 10.

In-game description
"Forged by Ilusarian Roan, a priest of Ilmater, this morning star sacrifices the wielder's strength in order to destroy the enemies of the faith. Roan used the morning star when he joined a company of knights and priests fighting against a cabal of Cyricists. He took down six cultists before he died, and the morning star was returned to the temple with his remains."