Errol is a Force affinity legendary from the Sacred Order. Errol is an out and out Arena champion with an ability to wipe out a single target easily with his A2 or his A3.
The issue with Errol is a lack of survivability to go alongside his nuke, you really need to play him alongside champions that can veil him or revive him to make real use. Strategies such as Cardinal full team revive and turn meter boost to let him nuke another person.
Remember each skill has 30% more chance to crit therefore you can comfortably build him with 70% crit rate.

Attacks 1 enemy. Has an extra 30% chance of inflicting a critical hit.
Level 2: Damage +5%
Level 3: Damage +10%
Level 4: Damage +10%

Attacks 1 enemy 3 times. Has an extra 30% chance of inflicting a critical hit. Each hit has a 50% chance to ignore DEF.
Level 2: Damage +10%
Level 3: Damage +10%
Level 4: Damage +10%
Level 5: Damage +15%
Level 6: Cooldown -1

Steals all buffs from a target enemy, then attacks the target. Has an extra 30% chance of inflicting a critical hit.
Level 2: Damage +15%
Level 3: Damage +15%
Level 4: Damage +15%
Level 5: Cooldown -1

Increases Ally ATK in Dungeons by 35%.

PVE Masteries

PVP Masteries