Tarak

Tarak is a character in the lore of Dota 2.

Biography
Tarak must've made the or at least was involved in its creation, since Tarak's possessive name is invoked when others cast this spell. Thus Tarak must be a mage.

But it isn't just Tarak who is invoked when others cast the spell, as Gallaron is also invoked when others cast it. It's unknown if these two mages are related to each other.

Since the young Invoker (who existed during the old times when spell-casting was once at its most potent form because it was still primarily a mnemonic art) learned the Chaos Meteor spell alongside his nine other invocations, Tarak must have existed during this golden age of magic as well and hence this obscure mage must've been an ancient one too.

Inheritance
In his youth, the learned Tarak's  alongside the nine other spells he currently wields, using two Exort orbs and one Wex orb to invoke this spell for casting.

Immortality
Having existed during the old ages when magic was primarily mnemonic, Tarak must've been quasi-immortal like the other mages whom Invoker sourced all of his spells from.

But this is just assuming that Tarak is still alive today, that is...

Magics
Much like the Invoker, Tarak must have had his power to spells using the two energies  and. Otherwise, Tarak would not possess or cast the spell (also known as Tarak's Descent of Fire,  Gallaron's Abyssal Carnesphere, or Voidal Pyroclasm ), a spell invoked with two Exort and one Wex.

This unsophisticated but powerful invocation tears a fiery meteor from outer space and plunges it down to the earth, pulverizing and incinerating everything in its path.