@Goatmeal - It was inspired by the game Terraria and various mods for it.

L is the sentry summoned by the Rainbow Crystal Staff and Q is a dropped piece of Luminite (used for Q because of the slight shape similarity). A, E, O, and U are vanilla Terraria's Stardust, Vortex, Solar, and Nebula Fragments, I is Sacred Tools mod's Quasar Fragment (used for I since it's the remaining vowel), C and S are Thorium mod's Celestial and Shooting Star Fragments, N is Tremor mod's Nova Fragment, and Z is Zoaklen mod's Stellar Fragment.

I sprite for an (as of now) unreleased mod called Elasidel, and used a few sprites I originally made for that as well: the Fusion Fragment, Gas Giant Fragment, Mercurial Fragment, Pulsar Fragment, Comet Fragment (used for R because the fragment is for the mod's Artist class), and Tesseract Fragment.