
Vanguard · magic (AP) damage
Zac is a Vanguard that deals magic (AP) damage and brings airborne, slow. Some of their lockdown (airborne) ignores tenacity, so you dodge it; you can't cleanse or Merc' through it. Below is Zac's highest-win-rate build from high-elo games; open the counter-build tool to tune it against your specific enemy team.

Each time Zac hits an enemy with an ability, he sheds a chunk of himself that can be reabsorbed to restore Health. Upon taking fatal damage, Zac splits into 4 bloblets that attempt to recombine. If any bloblets remain, he will revive with an amount of Health depending on the Health of the surviving bloblets. Each bloblet has a percentage of Zac's maximum Health, Armor and Magic Resistance. This ability has a 5 minute cooldown.

Zac stretches an arm, grabbing an enemy. Attacking a different enemy will cause him to throw both targets towards each other.

Zac explodes outward towards nearby enemies, dealing a percentage of their maximum health as magic damage.

Zac attaches his arms to the ground and stretches back, launching himself forward.

Zac bounces four times, knocking up enemies hit and slowing them.
Q Stretching Strikes
E Elastic Slingshot
R Let's Bounce!Slowignores tenacityFROM
Q Stretching Strikes
R Let's Bounce!Hover a crowd-control type to see which ability it comes from.
Resolve
Grasp of the Undying
Aftershock
Guardian
Demolish
Font of Life
Shield Bash
Conditioning
Second Wind
Bone Plating
Overgrowth
Revitalize
Unflinching
Precision
Press the Attack
Lethal Tempo
Fleet Footwork
Conqueror
Absorb Life
Triumph
Presence of Mind
Legend: Alacrity
Legend: Haste
Legend: Bloodline
Coup de Grace
Cut Down
Last Stand

Based on 4409 games · 50.6% win rate · challenger+grandmaster+master+emerald-diamond+platinum-emerald · patch 16.18.1.
Resolve
Grasp of the Undying
Aftershock
Guardian
Demolish
Font of Life
Shield Bash
Conditioning
Second Wind
Bone Plating
Overgrowth
Revitalize
Unflinching
Precision
Press the Attack
Lethal Tempo
Fleet Footwork
Conqueror
Absorb Life
Triumph
Presence of Mind
Legend: Alacrity
Legend: Haste
Legend: Bloodline
Coup de Grace
Cut Down
Last Stand

Based on 759 games · 52.2% win rate · challenger+grandmaster+master+emerald-diamond+platinum-emerald · patch 16.18.1.
Resolve
Grasp of the Undying
Aftershock
Guardian
Demolish
Font of Life
Shield Bash
Conditioning
Second Wind
Bone Plating
Overgrowth
Revitalize
Unflinching
Precision
Press the Attack
Lethal Tempo
Fleet Footwork
Conqueror
Absorb Life
Triumph
Presence of Mind
Legend: Alacrity
Legend: Haste
Legend: Bloodline
Coup de Grace
Cut Down
Last Stand

Based on 249 games · 44.2% win rate · challenger+grandmaster+master+emerald-diamond+platinum-emerald · patch 16.18.1.
Precision
Press the Attack
Lethal Tempo
Fleet Footwork
Conqueror
Absorb Life
Triumph
Presence of Mind
Legend: Alacrity
Legend: Haste
Legend: Bloodline
Coup de Grace
Cut Down
Last Stand
Resolve
Grasp of the Undying
Aftershock
Guardian
Demolish
Font of Life
Shield Bash
Conditioning
Second Wind
Bone Plating
Overgrowth
Revitalize
Unflinching

Based on 160 games · 46.3% win rate · challenger+grandmaster+master+emerald-diamond+platinum-emerald · patch 16.18.1.