Terror

Three attacks and a face full of error messages: Terror is a Legendary tier aura from Eon 1-7 that comes with a real moveset. Its base chance is 1 in 400,000, so about 400,000 rolls at 1x luck or 40,000 at 10x, with no biome required. H2OArea is the credited creator and the wiki lists it as obtainable. The in-game text is short: it is spreading dreadful screams.

The colours are bright pink and red. Spikes stick into the player's body, a glitchy error screen covers the face like Undefined, the floor shows a swirl of bright pink and black that grows and fades, and the limbs carry streaky pink aura with crackling electricity and Japanese katakana running up and down. The title has a shine on the letters T and E. Abilities: Slash on E swings a spear and sends a small ripple for 15 damage; X raises a six-pointed star that fades as a four-pointed one fades in, then releases a spherical scratch attack similar to Oblivion's for 18; F uses a spike and scratch pattern for 20.