Overall
Thesku is a debuff-stacking controller built around Serpent's Marks. His attacks and skills apply marks that deal damage over time, and at full stacks the marks detonate, dealing heavy damage, stunning the target, and draining their energy. His neurotoxin locks down the highest-attack enemy, forcing them into normal attacks only — and those attacks heal the target's victims instead of hurting them. His fire breath strips accuracy, crit rate, and crit amplification, with the debuff duration extending based on active mark stacks. His ultimate petrifies any enemy carrying enough marks, freezing their actions and energy recovery, then slowing them afterward. Enemies who damage his reactive shield get debuffed and receive marks of their own. He survives one lethal hit and instantly refills energy, giving him a second rotation. The kit layers overlapping disables — stun, petrify, intoxication, stat shred — that keep enemies crippled while the marks tick.
Skills
Ancient Terror
UltimateDeals damage to all enemies. Petrifies those with 3+ Serpent's Marks, blocking actions and energy recovery. Petrified enemies lose haste afterward.
Neurotoxicity
ActiveTargets the highest-attack enemy, intoxicating them. Intoxicated enemies can only use normal attacks, cannot recover energy, and their attacks heal their target instead.
Serpent's Mark
PassiveAttacks apply Serpent's Marks that deal damage over time. At 5 stacks, marks detonate for AoE damage, a stun, and energy drain. The DoT alone cannot kill.
Cursed Flame
ActiveMulti-hit fire attack. The final hit reduces accuracy, crit rating, and crit amplification. Debuff duration extends per active Serpent's Mark on the target.
Signature Item
Bone Flute
Every 20% max health lost triggers a shield. Enemies who damage the shield lose accuracy, crit stats, attack, and defense, and receive a Serpent's Mark.
Furniture
Furniture
Ultimate adds a Serpent's Mark to enemies below 3 marks. Survives first fatal hit with healing and full energy restore, losing two skills afterward.
Engravings are not listed here because they upgrade existing skills directly. See the Skills tab for engraving effects alongside each skill.
Thesku plays his bone flute and deals 240% damage to all enemies. If an enemy is marked, by more than 3 Serpent’s Marks, they are petrified and turned to stone, becoming unable to complete any actions or recover Energy for 5 seconds.
Thesku commands his snake, Zilsu to spit a deadly neurotoxin at the enemy target with the highest Attack Rating, dealing 220% damage to them, causing, them to become intoxicated. While in a state of intoxication, the enemy is unable to recover any Energy and may only use Normal Attacks for 4 seconds. During this time, damage dealt by the enemy’s Normal Attacks is converted into health for the target they are currently attacking.
When Thesku deals damage with his Normal Attacks and other skills, targets are marked with a Serpent’s Mark, which causes them to lose health worth 30% of Thesku’s Attack Rating every second, for 8 seconds, but shall not die as a result. Once the Serpent’s Mark has been stacked 5 times, the mark disappears, and a venomous explosion is triggered, which deals 260% damage to enemies and stuns them for 3 seconds.
Thesku commands his snakes, Zilsu and Szetzu to breathe fire upon any enemies within range, dealing 160% damage three times to the targets. Enemies struck by the third attack shall have their Accuracy reduced by 50 points, Crit Rating reduced by 30 points and Crit Amplification reduced by 30 points for 6 seconds. Effect cannot be stacked.
Bone Flute
Enhances: Serpent's GuardEach time Thesku has cumulatively lost 20% of his max health, once his current skill ends, his snake Ilshu grants him a shield that has a value equal to 15% of Thesku’s max health, which exists for 8 seconds.
Enemies that deal damage to the shield have their Accuracy reduced by 70 points, Crit Rating reduced by 40 points and Crit Amplification reduced by 40 points for 6 seconds. Effect cannot be stacked.
Value of shield is raised to 25% of Thesku’s max health.
Enemies that deal damage to the shield have their Attack and Defense Ratings reduced by 20% for 6 seconds. Effect cannot be stacked.
Enemies that damage Thesku's shield will be inflicted with 1 stacks of Serpent's Mark.
When an enemy is struck by the Ultimate skill “Ancient Terror”, if they are marked by fewer than 3 Serpent’s Marks, they will be marked by an additional 1 Marks.
Thesku is immune to fatal damage the first time he is dealt it, and he recovers 25% of his max health, and his Energy is immediately restored to 100%, but he will be unable to use his skills “Cursed Flame” and ” Serpent’s Guard” for the remainder of the battle.
The venomous explosion causes enemies to lose 200 Energy points.
When the third attack, deals damage to the targets, the negative effects inflicted on them by this skill are extended by 1 seconds for every Serpent’s Mark the targets are currently marked with.
Within Arena of Heroes, Legends' Challenger Tournament, Legends' Championship, Treasure Scramble, and Heroes of Esperia: