Blue Elite

Blue Elite was a promotional bonus: during the Christmas Event 2017, anyone who bought the Elite Gamepass received this knife, and the wiki says the aim was to convince players to buy the pass. When the event ended, the offer ended with it, and the knife is only available through trading now.

A pass that kept selling

The curated data notes that the Elite Gamepass itself is still on sale but no longer includes this knife, and that the pass costs 499 Robux per the Gamepasses page. Those two points come from the curated data; the knife's own page only states the 2017 offer.

Appearance

The blade is astronaut blue with a dark skull imprinted in the center, and the guard and handle are solid black. The skull design is the shared motif of the Elite family.

The Elite Set

The knife is a variant of Elite, and the other variant is Green Elite. Together they make the Elite Set. Green Elite was the earlier of the two promotional bonuses, handed out with the same pass during Christmas Event 2015, so Blue Elite is the repeat of that offer two years later.