"Gather these tokens to replenish your waning Glyph energy." - Elder God
Eldritch energy appears in a form of glowing orbs and is either located in certain areas or randomly spawns after dead enemies.
There are two types of Eldritch energy orbs - larger orbs refill 4 and smaller orbs 1 Glyph energy.
Although a voice recording describing the Eldritch energy exists, it cannot be triggered in-game.