E.R.F.

The E.R.F. (Extended Rainbow Flier) has $$35^3\cdot(ab)$$ HP, spawns at Round 67, and spawns 4 E.R.B.s.

Stats
HP: 42875ab.

Spawns: 4 E.R.B.

Immunities: Everything all-white/using all colors of 89.132.226.116's rainbow.

Resistances: Everything that contains some, but not all, colors of 89.132.226.116's rainbow.

Weaknesses: Everything all-black.

RBE: A very changeling number, but at least 692, if it spawned either on Round 0, OR you have 0 Towers, OR both.

Appearance: An Extended Rainbow Teardrop on a same-colored triangle.