Abaddon

Abaddon the Lord of Avernus is a melee strength Hero known as one of the most versatile characters in Dota due to his rather low mana dependence, short spell cooldowns and a large number of viable item choices. His ability to help sustain his allies and himself plus his strong tower diving capacity give him solid lane presence. Many of his abilities offer a large sum of utility, which makes him a strong support Hero. Mist Coil serves as both a single target nuke and heal that helps shift the sustainability of both allied and enemy heroes in a lane at his will, though sacrificing a portion of his own health. Aphotic Shield holds as one of the most useful abilities in the game, able to shield a target from some damage while also able to reflect said damage to a huge area. The most important aspect is how it is able to dispel many status effects such as slows and stuns. His other abilities allow him to become a mix between a semi-carry and tank. Abaddon's passive, Curse of Avernus, allows his attacks to not only slow down his enemy, but also increase the attack and movement speed of any ally attacking the same target. With his ultimate, Borrowed Time, Abaddon is able to shift all non-HP removal damage he receives into health. When not on cooldown, Borrowed Time may activate passively when his health falls under a certain threshold, even under the most dire situations. Due to his powerful spells and versatility, Abaddon is an excellent addition to any team.

Trivia

 * Abaddon's title, Lord of Avernus, is a reference to the famous crater in Italy, which was, in ancient times, believed to be the entrance to the underworld.
 * In DotA, Abaddon's third ability was originally called "Frostmourne." It was changed in transition to Dota 2 due to copyright reasons, since Frostmourne exists as a famed weapon in the Warcraft universe. When using Curse of Avernus, Abaddon says 'The mistblade bites', which is similar to Arthas's Quote: 'Frostmourne hungers'. Similarly, his first ability was originally named "Death Coil", but was likely changed to differentiate it from the ability used by death knights in the Warcraft universe; one of his responses when using Mist Coil references the original name.
 * In the Christian Bible, is the name of an angel who rises from the Abyss and commands an army of locusts. Abaddon in Hebrew means "Doom", which is ironic, given that Abaddon's skill set is focused on keeping his team alive.