Jah'rakal the Troll Warlord

The Troll Warlord, a Sentinel hero, is a killer who can be strong enough to take on Roshan alone. His skills are Berserker's Rage, Blind, Fervor and Rampage. The first skill turns him to a meelee hero from ranged and gives him bonuses together with a passive skill called Bash. Bash gives Jah'rakal a chance to stun an opponent and deal extra damage. He can turn to meelee and back to range at any time. The second skill causes an opponent to miss on some attacks. The third gives troll an attack speed bonus and also the allies close to where he is. His ultimate, when casted, gives his whole team a large attack speed bonus and small movement speed bonus, and will last twice as long on Troll. A good item for troll would be the Helm of Dominator, which gives the holder lifesteal and the ability to control a creep.