Hurts to Fight. Whenever Zac uses an attack roll he expends hitpoints based on his current hitpoints.  Zac deals himself a tenth of his current hp in damage (rounded down) but must deal himself at least 1 damage.  This damage can't be blocked by Temporary hitpoints

Rapid Consumption. If Zac hits a creature with an attack he regains 11 hitpoints but only one instance of healing per die rolled.  His body rapidly absorbs matter and he regains health in this manner.  Fascinating

Cellular Strength.  Upon reaching zero hitpoints Zac becomes unchangeably stunned until the end of next turn but instantly regains 25 hitpoints.  Attacks have advantage to hit during this stun.  This ability recharges after a long rest.

Elastic Launch.  Zac's high jump is 20 feet high and his horizontal jump is 35 feet.  Zac does not need to be moving to reach these distances.

Stretching Strikes. Melee Attack: +6 to hit, reach 10 ft., 2 targets. Hit: # (1d6 + 3) Bludgeoning damage. If both targets are within 5 feet of each other and both attacks land, deal an additional +5 damage to each target.  Roll individually for each target.

Unstable Matter. Melee Attack: +5 to hit, reach 5 ft., all enemies within range. Hit: # (3d4) Bludgeoning damage.  Roll once for all targets.

Elastic Slingshot. Melee Attack: +8 to hit, reach 35 ft., 1 targets. Hit: # (1d10 + 3) Bludgeoning damage. Zac launches himself over (20 feet high) obstacles on his way to his target.  After the attack he ends up within 5 feet of the target.  If there is nowhere to go then he and the target share the same square and Zac is considered to be squeezing. During this movement Zac ignores attacks of opportunity 

Let's Bounce! Recharge 6 Melee Attack: +10 to hit, reach 0 ft., 3 targets. Hit: # (1d12 + 3) Bludgeoning damage. Zac bounces around, moving 15 feet, dealing damage to enemies whose squares he moves through.  After the attack he ends up within 5 feet of the target.  If there is nowhere to go then he and the target share the same square and Zac is considered to be squeezing.  During this movement Zac ignores attacks of opportunity.  Zac rolls for each target