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Guest 6801328
Guest
And a more generic explosive dive.
Explosive Dive:
When you are targeted by an attack or succeed on a Dexterity saving throw, you can move up to half your speed, without provoking an Opportunity attack, and land prone at the end of this movement. This movement can potentially get you out of range, causing the attack or effect to be wasted.
I like Prone as a cost. A more general version is: "When you are required to make a Dexterity save versus an area effect, you can use a reaction to dive out of the way. You get Advantage on the saving throw*, but you end the turn Prone."
*Alternately it could apply only to damaging spells, and reduce damage to half or none.