I just spotted this from the SNS, there's going to be some kind of event mission on May 21, from 20:00 to 21:00 server time. There should be three missions added to Tetorod Base's MC on Gald at that time, which can award demon force bot parts. Either completing the same mission more than once or completing two different missions will earn you 5 MT and one of each pyroxene, awarded on May 30th. Additionally it looks like if the whole server completes them 21 times, we get a bonus week from the 25th until the 31st~ But I may be wrong about who needs to do what how many times because I'm not the greatest at Japanese, if someone knows more, here's the official announcement: http://www.c21-online.jp/info/topic/25386
The missions will be from one to ten players and have to do with the defense of Almos from a massive attack (yet are at Gald's MC~) and they pretty much said there will be Anikis, Satifars, and Dalkasas in them. The first has no restrictions, the second will be for sergeant and above, with an 18,000 cost limit, and the thrid for lieutenant and above with a 10,000 cost limit.
Anyway if you do participate, good luck!