Ring of Evasion
Ring, rare, requires attunement · 2024 rules, SRD 5.2
This ring has 3 charges, and it regains 1d3 expended charges daily at dawn. When you fail a Dexterity saving throw while wearing the ring, you can take a Reaction to expend 1 charge to succeed on that save instead.
Also in the 2014 rules (SRD 5.1).