Ihave alot of Dark Deivel Coins what i should do with it ?

post screenshot so we know exactly what you are talking about

You can turn them in when the Bosd Event is at 100% and the boss is dead.

250 silver coins = 5% anti crit title
30 gold coins = special title ( varies on month )
20 silver = 1 gold

When you killed 30/30 majin buus you can turn in quest and get additional 2 gold coins

I recommend to save as much as u can. And then if u got enough buy the capsel. Every npc got 3 cd title was the rumor. And also thougth tge cd title isnt bound so u can sell it in ah for about 400-500. kk (just had it once and sold it). Just to renind u it only have 5 cd I think and its really not worth to use. Exept Kid tournament I thibk if u can use. But yeah. Of ur a speed fughter or need cd use it.