I survive, but I need to know how.
I have one ability: Memory of One Thousand Steps
At 3rd level, you gain the ability to use psionics to recall your steps. As a reaction when you are hit by an attack, you can teleport to an unoccupied space that you occupied since the start of your last turn, and the attack misses you. Once you use this feature, you can’t use it again until you finish a short or long rest.
I can only use it once, but I don't know if this counts, since it's a failed save (I rolled a 12.) This isn't the same as the Defensive Step ability that lets me increase my AC by 4, possibly making the attack miss and teleporting. This is just "hit by an attack, you teleport and the attack misses" once per short or long rest. Up to you if I can use this here.
If I can't use this, then I've got a reactive Elemental Resistance ability that'll cut the damage in half. I just need to know which one I can use before I can post. Obviously the first one negates all damage, so is better, but it's your call.