Lonk the Sane

Lonk, also known as Lonk the Sane, is a dwarven wizard aligned with the Cowled Wizards who serves as a caretaker at Spellhold, also known as The Residence for the Magically Deviant. Here, he attempts to keep the inmates docile and in-order with cajoling, offers of baked goods, and powerful magical abilities.

History
During 1369 DR (the time of Baldur's Gate II: Shadows of Amn), Lonk was working at Spellhold. When Jon Irenicus broke out and massacred the Cowled Wizards working at the asylum, he chose to spare Lonk for reasons that the player never comes to learn.

Interactions
If the player opts to enter the asylum by having themselves declared insane by the Pirate Lord, Lonk will greet them once they wake up in their cells, explaining who he is in a perfunctory manner before telling them to join the other inmates in their rest period.

Regardless of how they entered the asylum, after the party fights their way back to the Main Floor from the testing dungeon below, Lonk will intercept them and incredulously demand they go back to their cells. The player can either bribe Lonk to give them the keys to the cells so they can rally the inmates as an army against Irenicus, or kill him and take the key from his corpse.

To bribe Lonk costs 2000 gold pieces. The player can also offer 200 or 10,000 gold pieces, but these will both prompt Lonk to attack - the former for the paltry scale of the bribe, the latter out of incredulous dismissal that the player could have that much money.

Unconfirmed! It is also apparently possible to talk Lonk into giving you the key and leaving peacefully if you have sufficiently high Charisma and Wisdom.

Fighting Lonk is not easy; he has the power to cast spells like Invisibility, Mirror Image, Spell Turning, Flesh to Stone and Finger of Death.