My very good King Arthur build and Guide

Standard (Overhead Slash): King Arthur deals a devastating overhead blow in Melee range that creates a slashing attack that travels forwards. Enemies hit by the Melee strike take bonus damage from the Slicing attack.

Combo (Hamstring): King Arthur swipes low, crippling and damaging enemies that are struck.

Ability Type: Line, Damage
Slash Damage: 60 / 110 / 160 / 210 / 260 (+60% of your Physical Power)
Melee Bonus Damage: 30 / 35 / 40 / 45 / 50%
Combo Damage: 70 / 125 / 180 / 235 / 290 (+60% of your Physical Power)
Cripple Duration: 1.25s
Energy Gain: 3
Range: 70/30
Cost: 35 / 40 / 45 / 50 / 55
Cooldown: 14s

Standard: King Arthur stomps on the ground with heavy force, causing enemies around him to take damage and become slowed.

Combo: King Arthur charges forward, stopping on first god hit. At the end of the charge King Arthur unleashes an uppercut, knocking up enemies into the air.

Ability Type: Circle, Slow, Damage
Stomp Damage: 55 / 80 / 105 / 130 / 155 (+40% of your Physical Power)
Slow: 30 / 32.5 / 35 / 37.5 / 40%
Slow Duration: 2.5s
Uppercut Damage: 50 / 95 / 140 / 185 / 230 (+40% of your Physical Power)
Energy Gain: 4
Range: 20/35
Cost: 40 / 45 / 50 / 55 / 60
Cooldown: 14s

Standard: King Arthur unleashes two cleave attacks while charging forward. Enemies hit by a cleave take damage and have their protections reduced.

Combo: King Arthur swings Excalibur around him, charging forward and damaging enemies 5 times before winding up a final strike that deals more damage. King Arthur is immune to Knockup for the duration.

Ability Type: Dash, Debuff, Damage
Cleave Damage: 35 / 60 / 85 / 110 / 135 (+30% of your Physical Power)
Protection Shred: 10%
Spin Damage: 15 / 35 / 55 / 75 / 95 (+15% of your Physical Power)
Final Damage: 35 / 90 / 145 / 200 / 255 (+40% of your Physical Power)
Energy Gain: 1.5
Range/Radius: 30/10
Cost: 40 / 45 / 50 / 55 / 60
Cooldown: 16s

35 Energy (Sundering Strike): King Arthur winds up a massive jab, charging forwards slightly before striking. Enemies hit by this jab are stunned for 1s.

80 Energy (Excalibur's Wrath): King Arthur charges forward with Excalibur drawn. If King Arthur hits an enemy god, he launches them into the air and unleashes a barrage of 6 attacks, after which he launches them back to the ground dealing damage to the target and any enemy below.

Ability Type: Line, Stun, Damage
Jab Damage: 100 / 155 / 210 / 265 / 320 (+65% of your Physical Power)
Charge Damage Per Hit: 10 / 25 / 40 / 55 / 70 (+10% of your Physical Power)
Charge Max HP Damage per Hit : 2% Max HP Damage as Physical Damage
Landing Damage: 50 / 100 / 150 / 200 / 250 (+50% of your Physical Power)
Landing Max HP Damage: 5 / 6 / 7 / 8 / 9% Max HP Damage as Physical Damage
Mana Cost: 35 (80) Energy & 40 Mana
Cooldown: 20s