Koryx

Koryx is a character in the lore of Dota 2.

Biography
It's implied Koryx made or at least was involved in the creation of the spell, since their possessive name is invoked when casting it. Thus, Koryx is possibly a mage.

Seeing how the young Invoker (who existed during the ancient times when spell-casting was once at its most potent form because it was still primarily a mnemonic art) learned this Ice Wall spell alongside his nine other invocations, Koryx must have existed during this golden age of magic as well and thus this obscure magician must've been an ancient one too.

Inheritance
In his youth, the learned Koryx's  along with the other nine spells he currently wields, using two Quas orbs and one Exort orb to invoke this spell.

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

Koryx must've been immortal, that is, assuming that this mage is still alive today like Gallaron...

Magics
Like the Invoker, Koryx might have the power to spells using the energies of  and. Otherwise, they can't cast or even have their spell (also known as Killing Wall of Koryx  or Bitter Rampart ) which requires two Quas orbs and one Exort orb to invoke. However, young Invoker says he calls upon ice and storm instead.

A simple elemental spell, this invocation generates a slippery wall of solid ice that not only blocks paths, but also emanates a bitter cold that chills and slows nearby victims.

Upon casting this spell, the Invoker may mention the beckoning of a harshly cold place called the “White Waste” for some reason. This interesting line may imply the following:
 * The White Waste sounds similar to Icewrack's other name, the Frozen Waste. “White” may refer to its icy landscape, while "Waste" means it's a barren or desert like Icewrack.
 * If this harsh waste is Icewrack, then this spell may come from the Frozen Arts, whose icy magic draws upon the realm and its coldness, such as and.
 * Regarding the spell using ice and storm, this sounds similar to the Frozen Arts', which uses wind (an element included in the storm element Wex) to cause ice.