The Chronurgy Wizard's 14-th level ability lets you (or someone else) unconditionally succeed a saving throw, at the cost of a reaction and a level of exhaustion:

Convergent Future
Starting at 14th level, you can peer through possible futures and magically pull one of them into events around you, ensuring a particular outcome. When you or a creature you can see within 60 feet of you makes an attack roll, an ability check, or a saving throw, you can use your reaction to ignore the die roll and decide whether the number rolled is the minimum needed to succeed or one less than that number (your choice).
When you use this feature, you gain one level of exhaustion. Only by finishing a long rest can you remove a level of exhaustion gained in this way.

The Chronurgy Wizard's 14-th level ability lets you (or someone else) unconditionally succeed a saving throw, at the cost of a reaction and a level of exhaustion:

Convergent Future
Starting at 14th level, you can peer through possible futures and magically pull one of them into events around you, ensuring a particular outcome. When you or a creature you can see within 60 feet of you makes an attack roll, an ability check, or a saving throw, you can use your reaction to ignore the die roll and decide whether the number rolled is the minimum needed to succeed or one less than that number (your choice).
When you use this feature, you gain one level of exhaustion. Only by finishing a long rest can you remove a level of exhaustion gained in this way.

Under my interpretation of this ability, this can make you succeed on saving throws even if you would not succeed by rolling a 20, but that interpretation of the ability does not seem to be universal, so whether or not this ability can do that would be up to your DM's interpretation.

The Chronurgy Wizard's 14-th level ability lets you (or someone else) unconditionally succeed a saving throw, at the cost of a reaction and a level of exhaustion:

Convergent Future Starting at 14th level, you can peer through possible futures and magically pull one of them into events around you, ensuring a particular outcome. When you or a creature you can see within 60 feet of you makes an attack roll, an ability check, or a saving throw, you can use your reaction to ignore the die roll and decide whether the number rolled is the minimum needed to succeed or one less than that number (your choice).
When you use this feature, you gain one level of exhaustion. Only by finishing a long rest can you remove a level of exhaustion gained in this way.

The Chronurgy Wizard's 14-th level ability lets you (or someone else) unconditionally succeed a saving throw, at the cost of a reaction and a level of exhaustion:

Convergent Future
Starting at 14th level, you can peer through possible futures and magically pull one of them into events around you, ensuring a particular outcome. When you or a creature you can see within 60 feet of you makes an attack roll, an ability check, or a saving throw, you can use your reaction to ignore the die roll and decide whether the number rolled is the minimum needed to succeed or one less than that number (your choice).
When you use this feature, you gain one level of exhaustion. Only by finishing a long rest can you remove a level of exhaustion gained in this way.