While not a physical character, the Wishmaster is a powerful, malevolent force that grants wishes but at a terrible cost. It manipulates and twists events, leading to disastrous consequences for the characters. The Wishmaster's motives are never fully revealed, but it seems to derive pleasure from causing chaos and suffering.
It's important to note that the Wishmaster is not a singular entity but rather a mystical force that operates through various means, often manifesting through the actions of others or even the characters themselves. It's a subtle and insidious force that works behind the scenes, making it a truly compelling antagonist.