The strongest of the Sibelons, the Uber Sibelon is found only in 4-5 and packs a substantial punch in return for pretty good rewards.
Uber Sibelon are eight times stronger version of the Regular alien; Sibelon and two times stronger than the Boss Sibelon. They are dangerous aliens to deal with alone and should be dealt with in teams or outfits. The rewards given are substantially good, but difficult to attain. They give half the rewards and less cargo box rewards than a Boss Kristallon but have higher damage, although Kristallons are faster. They are not worth your time, unless for missions.