Einherjar - The Viking's Blood (what is it with blood today?) has announced its own Halloween event going on from now until 10/31. In it, players will be tasked with collecting different components to craft their treats which will produce exclusive items. Details from the press release below (typos their own):
There will be some new materials (HAP, PY, HALLO, and WEEN) created for this unique event during the above-said period. Players are required to collect all those parts which constitute the phrase “HAPPY HALLOWEEN” to produce 1 Halloween Treat, then use it to produce items at a newly-crealted tab called Halloween of the Production section.
Read more over at the Einherjar site.