From Destinypedia, the Destiny wiki
The Vex Mythoclast is an exotic weapon obtainable in Destiny by completing the Vault of Glass raid on Hard mode.  It is a unique one-of-a-kind fusion rifle that fits into the Primary Weapon Slot. Unlike other fusion rifles, it has no charge time; a single squeeze of the trigger fires a shot, and it is capable of sustained fire, making it behave more like an auto rifle while benefiting from fusion rifle perks on armor. It also has the ability to deal precision damage, unlike the other fusion rifles.
The Vex Mythoclast has an upgrade tree similar to other Exotic weapons. It possesses the Aggressive Ballistics, Linear Compensator, and Smart Drift Control upgrades on its first column of upgrade nodes. The next non-damage upgrade is Zen Moment, an upgrade that causes the Mythoclast to increase stability upon causing damage. Its next column of three contains the Extended Mag upgrade, increasing the magazine to 35, the Send It upgrade, increasing range and accuracy, and the Lightweight upgrade, giving the player +2 Agility while wielding it. After the second column, the Vex Mythoclast unlocks the Crowd Control upgrade, causing it to deal increased damage after every kill.
The Mythoclast is a very powerful weapon in both PvE and PvP. In general gameplay, it possesses a high rate of fire and a high damage value. With the House of Wolves expansion, the maximum Attack values for the Mythoclast and other Exotics have been increased to 365 with an expenditure of 1500 Glimmer, 25 weapon parts and an Exotic Shard . Due to its high rate of fire and low stability, the Mythoclast is recognized as having a high amount of recoil. In PvP it is widely considered to be one of the most powerful weapons in Destiny history. It is often seen that many current Power Weapons would not be able to compete with Vex Mythoclast pre-nerf. The Vex Mythoclast possesses a very high precision damage rate, at 1.5x, making it a very effective weapon for getting headshots. It is very common to run out of ammo quickly with the Mythoclast, as it has a high fire rate and only a 21 magazine. It is this reason that the Extended Mag upgrade is one of the more popularly used ones. The Vex Mythoclast can carry a maximum ammo reserve of 175 (extended mag, 147 for 21-round magazine), but in a recent update has been increased to 200. Previously before the update, with armor that allows a player carry more ammo for fusion rifles, it was 227, but after the update, was increased to 250. In a later update, this was again changed to 161 (with 203 in reserve with Fusion Rifle ammo-carrying armor mods), and finally changed in Update 2.0 with Extended Mag changed to 28 instead of 35 with a reserve of 140 (with Fusion Rifle ammo carrying armor mods, this changes to 163). The Attack value was also changed from 365 to 170 Attack.
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