Enigma

Enigma is a ranged intelligence hero who uses his abilities to cripple his enemies, supported by a seemingly inexhaustible army of creeps. His fearsome abilities can bind entire teams under his might. Enigma is also a formidable jungler and pusher owing to his ability to create creeps.

The deliverance of his ultimate, Black Hole, engulfs an area around him with dark energies and disables enemies caught within it, making him an extremely powerful yet conditional initiator and disabler. His Midnight Pulse consumes sections of enemies' life in a region over time and his Malefice stuns targets. His trademark ability is Demonic Conversion, which splits a creep into three eidolons under his control. If they can land enough attacks on an enemy unit before their expiration, they multiply and are healed to full health.

Tips

 * Keeping Eidolons around you is a very good idea when there is a Pudge or Mirana on the enemy team, as it makes you very difficult to be hooked or arrowed, which is important considering that Enigma is very easy prey for kills in the early game.
 * In sufficient number, Eidolons can be used effectively in encounters, as en masse their collective attack does significant damage. If you die in an encounter and you have Eidolons still alive, use them to boost your team's damage a little.
 * Enigma's presence in encounters is greatly diminished while Black Hole is on cooldown, but he can make himself useful by saving Malefice for a crucial moment and also sneaking around to use Midnight Pulse within an area the enemies may try to escape through. A good combo is to use Malefice on an enemy walking through Midnight Pulse.
 * Enigma works best with allied heroes who have strong AoE capabilities, such as Warlock or Queen of Pain.
 * Enigma can kill Roshan before the 10-minute mark, with the help of Level 3 or 4 Eidolons. For acquiring them, use Demonic Conversion on either a neutral creep if he's on the Radiant side, or a lane creep if he's on the Dire side. An item commonly picked up is a Medallion of Courage, as it allows him to reduce Roshan's armor for a higher damage output.  Begin the fight by tanking Roshan yourself, until your Eidolons have multiplied; let the Eidolons take over and apply a Healing Salve.  Try to micro the Eidolons to distribute the damage that Roshan does to them.  Re-cast Demonic Conversion on one of the Eidolons before they expire and repeat the process (tank, heal up, nuke).  If executed properly, Roshan will fall within about one minute.
 * Enigma's large mana consumption means that an Arcane Boots can be an effective boots upgrade. If the player chose to ignore upgrading boots, Boots of Travel may be taken later on to take advantage of his pushing power.
 * Necronomicon is a powerful tool when used with Black Hole.
 * Shadow Blade is a viable alternative to Blink Dagger.
 * Force Staff is a great substitute for Blink Dagger, offering some Intelligence.
 * Rod of Atos also works on Enigma as it helps with both his mana and health.
 * Blademail discourages Heroes outside of your Black Hole from attacking you. Ghost Scepter can be used to a similar effect.
 * Urn of Shadows may also prove to be a useful item on a team with hardcore gankers as the mana regeneration and strength boost really helps him out early in the game.
 * Enigma can get Mekansm and Pipe of Insight quickly thanks to his jungling ability.
 * Linken's Sphere, as an alternative to Black King Bar, is a good item when up against Heroes with disables as their ultimates such as Doom and Bane.
 * One of the deadliest combos executed with Black Hole is Sand king's Epicenter. Locking all heroes in will allow Sand King to channel it safely, while also making sure the pulses hit 95% of the time, dealing extraordinary damage. Even more so if both have Aghanim's Scepter.
 * Investing 1 point in Midnight Pulse for early game will suffice. The removal of up to 33% health would make the opponents easy to kill. No more points should be invested until the other 2 spells are maxed because nukes tend to be strong during that phase, and 33% is already harmful.

Trivia

 * Many of Enigma's responses are references to Nietzsche's works; the line, " enig_attack_08.mp3 I stare also into you." references a passage in Beyond Good and Evil, where it is stated that "Should you stare long enough into the Abyss, the Abyss stares also into you".
 * One of Enigma's responses to Faceless Void is: "Even time may fail in face of gravity.". This is most likely a reference to the time dilating effect of gravity.
 * Many of Enigma's responses are also references to concepts in cosmology (the Big Bang, gravity wells, redshifts, and black holes) or particle physics (path integrals, universal constants).
 * In DotA, Enigma's hero name was Darchrow. In transition to Dota 2, his name was removed, most likely to emphasize his hero title.
 * Enigma, Io, Keeper of the Light and Chaos Knight together represent the four fundamental forces of the universe with Enigma representing the gravitational force. This is reflected in several of Enigma's responses to these heroes. " enig_ally_14.mp3 The Fundamentals unite."
 * The term "eidolon" comes from ancient greek literature, where it refers to a human-like phantom, the shade of one who died.