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 coupled with his abilities' almost inexistent cooldowns and huge item viabilities. His ability to help sustain his allies and himself and his strong tower diving capacity gives 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. It's most important, though sometimes overlooked, aspect however is how it is able to dispel many status effects such as ranging from simple overtime damage to heavy disabling stuns and slows. His other abilities also allow him to become a mix between a semi-carry and tank, an example of which is his passive Curse of Avernus which allows his attacks to not only slow down his enemy target, but also speed up both himself and his allies who seem to be targetting the same opponent. With his ultimate, Borrowed Time, Abaddon is able to shift all non-HP removal damage he receives into remedies, healing him of the same value. When not off cooldown Abaddon is able to do it upon himself to cast it passivley when under a certain health threshold, even under the most dire situations. With good awareness, the Lord of Avernus can clearly help keep most of his team alive without ever having the worry of being focused down or dying too early.

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 skill 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. Similarly, his first skill 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 Abbadon's responses when using Mist Coil references the original name.
 * In the Bible, is the name of an angel, who will rise from the Abyss and command an army of locusts.