Buluphont

Buluphont is a character in the lore of Dota 2.

Biography
This entity must've been the creator, or at least was involved in, the creation of the, since it's also known as "Buluphont's Aureal Incapacitator." Since Buluphont had something to do with this spell, Buluphont is likely a magician.

Seeing how the young Invoker (who existed during the ancient days when magic was once at its most potent form because it was still primarily a mnemonic art) learned this Deafening Blast spell alongside his nine other invocations, wielding them all with the rare and ancient sorcery of invoking, Buluphont must have existed during this golden age of magic as well & thus this obscure magician must've been an ancient one too.

Inheritance
In his youth, the learned Buluphont's  alongside the nine other spells he currently wields, using all three orbs to invoke this spell for casting.

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

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

Magics
Much like the Invoker, Buluphont must have had this ability to spells and the energies of, , and  to cast invocations. Otherwise, Buluphont would not be able to use the (also known as Buluphont's Aureal Incapacitator ), a spell that's invoked using one of each the three elemental magic orbs.

Using all three elements at once, this spell unleashes a mighty sonic wave that deafens those caught in its blast, leaving them reeling from this attack.