loadinggriefloadinggriefloadingUser premium, server premium, and what changes in your server.
Two tiers: user premium follows you into every server, server premium lifts limits for everyone in one server. The caps for any command are on its detail card on the commands page, and ;premium shows what your account already has.
Server premium also unlocks ;customise, which changes grief's nickname, avatar, banner and accent colour in your server. It changes nothing outside it.