Acererak's Annhilating Wish

What would be an unthinkable cost for a mortal is merely a minor transaction for those who have gained mastery over death. By simply speaking aloud, you can alter the very foundations of reality in accord with your desires. 

The basic use of this spell is to duplicate any other spell of 8th level or lower. You don't need to meet any requirements in that spell, including costly components. The spell simply takes effect.

Alternatively, you can create one of the following effects of your choice:

• You create one object of up to 100,000 gp in value that isn't a magic item. The object can be no more than 300 feet in any dimension, and it appears in an unoccupied space you can see on the ground.
• You create one non-legendary magic item.
• You cause a single creature that you can see to die.
• You banish a single creature that you can see back to its plane of existence. It cannot leave that plane by any means except a wish spell for a year and a day.
• You allow up to twenty creatures that you can see to regain all hit points, and you end all effects on them.
• You grant up to ten creatures that you can see resistance to a damage type you choose.
• You grant up to ten creatures you can see immunity to a single spell or other magical effect for 24 hours. For instance, you could make yourself and all your companions immune to a lich's life drain attack.
• You undo a single recent event by forcing a reroll of any roll made within the last round (including your last turn). Reality reshapes itself to accommodate the new result. For example, a wish spell could undo an opponent's successful save, a foe's critical hit, or a friend's failed save. You can force the reroll to be made with advantage or disadvantage, and you can choose whether to use the reroll or the original roll.
• You force a single outcome to occur within 24 hours by determining what the next attack roll, saving throw, or ability check will be for a creature in response to a certain event. For example, you could decide that the next time one of your allies makes an attack roll against an undead creature, the number that they roll for that attack will be 20. If the described event does not occur within 24 hours of casting this spell, then your forced outcome does not occur. 

You might be able to achieve something beyond the scope of the above examples. State your wish to the GM as precisely as possible. The GM has great latitude in ruling what occurs in such an instance; the greater the wish, the greater the likelihood that something goes wrong. This spell might simply fail, the effect you desire might only be partly achieved, or you might suffer some unforeseen consequence as a result of how you worded the wish. For example, wishing that a villain were dead might propel you forward in time to a period when that villain is no longer alive, effectively removing you from the game. Similarly, wishing for a legendary magic item or artifact might instantly transport you to the presence of the item's current owner.

Casting this spell to produce any effect other than duplicating another spell destroys you utterly. You die, and your body and any non-magical possessions on your person disappear without a trace. Nothing within your wish can prevent this event from happening.