im not completely sure, but it looks like Dagger of Punishment.

I like these ideas a lot. Will there be a limit on the number of slots a player can rent? If this is say a credit system, if we don't have enough money in the account to keep it open will it deduct beyond the limit and give us a warning to pay it up within a # of days/weeks, ect or just temporarily disable it till it is payed off? And for those of us who have our lockers payed off until the end of the next century, will we be refunded the 5k per month or will we have a 50 slot locker? I think that pretty well covers what I want to know, thanks Angroth