Wish is the mightiest spell a mortal creature can cast. 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 conjure anything you desire from 1st level. 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 infinite value. (can be a magic item.) The object can be no more than 1000000000 feet in any dimension, and it appears in an unoccupied space you can see on the ground or air.
• You allow up to twenty creatures that you can see to regain all hit points, and you end all effects on them described in the greater restoration spell.
• 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 8 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 re-roll to be made with advantage or disadvantage, and you can choose whether to use the reroll or the original roll.
• You can summon anything and it will be under your and anyone you give controls, control 

 
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 right.

note you have to explicitly state what you want or face the consequences.