I've got a bunch of them lying around collecting dust.
Also, this might be a stupid question but how does the beelzebub raid work? How do you join?
In the future, reanimators will be used again yes. Gotta save a good chunk of about 300-400 reanims for when Busan chapter 1 comes out, cuz with it comes the Busan gear (mods and receiver specifically, tho receiver isn't that great so only get the mod)
Reanimators can be used for crafting Gear booster fuel I (20 per week/ 10 per craft) and for crafting SS gear tuners (5 per week/ 30 per craft i think).
You can join BB raid every even day (tues/ thurs/ sat) in a 10 hour window UTC+0 1400-0200. After completing the main story quest in Dream theater reverse, within the time period, you will be able to enter the BB raid by either creating or finding a group.