Helmet of Opposite Alignment

Helm of Opposite Alignment, is a cursed helmet that will change the wearers alignment to the opposite. The helm can then only be removed with a Remove Curse spell. Its basic use is to change the alignment of an NPC so they can equip alignment restricted gear. This item appears in Baldur's Gate and Baldur's Gate: Enhanced Edition.

In Baldur's Gate it could be found by performing an exploit kill on the Demon Knight when he showed up in the first level of Durlag's Tower.

In Baldur's Gate EE it can be acquired by killing the Demon Knight in the final challenge of Durlag's Tower.

In-game sescription
"The cursed Helm of Opposite Alignment is a truly fearsome item. As its name suggests, it has the power to alter the fundamental ethical framework, nay, the very identity of anyone unlucky enough to wear it. It can ruin homes, friendships, even entire cities or nations. Should the legions of evil ever force one onto the head of a benevolent solar, the multiverse, as we know it, will surely meet an abrupt and painful end."