Crom Faeyr is an enchanted war hammer +5, which means it is not affected by spells like Improved Mantle, but will be by Absolute Immunity and Protection From Magical Weapons. It raises the strength of the user to 25. The hammer is able to inflict 2d4+3 of crushing damage and five points of electrical damage and has -5 bonus to THAC0 and a speed factor of 1. This warhammer has the ability to instantly slay Stone Golems, Clay Golems, Trolls and Ettins when hitting them.
This item appears in Baldur's Gate II: Shadows of Amn and Baldur's Gate II: Enhanced Edition and is the most powerful war hammer in the game and is arguably the best weapon. The hammer can be obtained if the Hammer of Thunderbolts, Gauntlets of Ogre Power, Girdle of Frost Giant Strength and a Crom Faeyr Scroll are combined by Cromwell for 10,000 . Because the weapon does a tremendous amount of damage by itself (featuring a whopping +5 electrical damage to each successful hit) and carries a ludicrous +5 bonus, the weapon would be among the most powerful in the game before the strength modification (which comes with an awe inspiring -7 to THAC0 and +14 to damage). It will typically hit far harder than even two handed weapons like Carsomyr +5. The weapon deals 20-30 points of damage with normal hits and about 55-65 points with critical hits, without the electrical damage included.
It can be acquired as well in The Black Pits II: Gladiators of Thay as a reward item after defeating the Golem in Tier 3 - Battle 2 (Battle 12).
In Baldur's Gate II: Throne of Bhaal this weapon is often seen as an "off-hand" option as there are opponents in this game that are immune to +5 enchanted weaponry, but will still provide the 25 strength bonus to the "main-hand" weapon.
|“||This is the true name that the dwarven weaponsmith, Silverblade, gave to the weapon he intended to create for his son. Alas, his son died before the weapon was ever completed, but here it stands complete... forged from the combined magic of the original hammer with the gauntlets of ogre power and a girdle of frost giant strength. Crom Faeyr gifts its users with all the powers of the original Hammer of Thunderbolts, in addition to enormous strength and the ability to kill golems, ettins and trolls in one blow.||”|