Kil'Groth is a strong warrior from the ocean. Every normal attack will increase his attack speed makes his attacks as ferocious as the waves.
Abilities
Passive - The Fanatic
Attack speed increased for each normal attack can add up for eight stacks. The third normal attack will have a larger attack range. The Fanatic can only be triggered when a target is hit and will last for three seconds in absence of normal attack.
Ability 1 - Sea Spear
Kil'Groth charges forward dealing physical damage to enemies along the path and slowing their movement speed. the cooldown will be reduced when it hits enemy heroes. Sea spear has a pretty long cool down so it's better to keep sea spear to the end of the fight to chase down the enemy.
Ability 2 - Enraged Spear
after learning this ability Kil'Groth's third normal attack will deal an additional magic damage. When the ability is activated every normal attack in the next two seconds deals additional magic damage. For each target Kil'Groth hits will restore his HP.
Kil'Groth can hit more than three enemies, but will only restore HP up to three times per attack HP. Also, restores by 150 percent when killed Roth's HP is less than 50%. Know when enraged spear is applied attack range will get increased equivalent to the third normal attack range increased by the passive.
Ultimate - Gore Lord
Gore Lord immediately provides Kil'Groth with four stacks of sea spear, removes control effects,and makes Kil'Groth temporarily immune to them. In six seconds gore Lord also increases Kil'Groths moving speed but will reduce progressively. Afterwards you can activate this ability when an enemy is trying to control you or activate it before entering a battle to ensure stable damage.
As a warrior, Kil'Groth has limited attack range and is not suitable for clearing waves. He can be easily suppressed in battle lanes, therefore, jungling will be a good choice for Kil'Groth.
Since sea spear has a very long cool down Kil'Groth should level enraged spear first to speed up farming and recover himself. Whenever needed Kil'Groth is great for melee but should be careful to not get kilted by his foes. Using sea spear to slow enemies down can create a favorable battleground.
In the mid and late game, it is key to use Gore Lords anti control effect to trick enemy's control abilities. Kil'Groth can use sea spear to initiate the attack then trade Gore Lord with enemy's control abilities to ensure teammates damage lock up the win.
Lore
The Blood red sea roiled and boiled with Fury
Kil'Groth was the ruler of the seas, where rage served as the only way to survive. Survival of the fittest was the normal natural order, but Kil'Groth's fanaticism stemmed from a complete disregard for balance in the food chain. The only thin he cared about was instilling the fury of ill in all sea creatures. As for what they killed, well, that was up to them.
Relentless slaughter served as the source of power of Kil'Groth's rage. Fresh blood diffusing into the seas aroused swarms upon swarms of deep sea predators which then filled the gaps left in the food chain. Such intense rage of power was intoxicating for the demons.
Taara, the commander of the Fallen, wielded her hammer like the coming of a cyclone. She used the power of absolute zero ice to freeze the ocean surface. The water, which was heated by fresh blood cooled and even Kil'Groth felt the effects. His pride, however, did not allow him to flee a fight. His raging will blazed and freed Kil'Groth from his icy confines. He picked up his massive sea blade and began his last charge towards the intruder.
Many hundreds died at Kil'groth's hands, but, under the command of Taara, the flood of the Fallen drowned him like a massive tidal wave. When the bloody battle ended, the dying Kil'Groth lacked the strength to even hold his weapon. In fact, if Cresht hadn't led the beast army to the rescue, Kil'Groth may have died there and become a legend in his own right.
However, Kil'Groth recovered from his wounds and ended up joining the Forest of Shadows array to show his gratitude as well as exact revenge. The furious Kil'Groth refused to follow orders from anyone. If any of the Fallen dared to insult him, his rage would finish them in an instant.