Added in 1.9.7
/ruser [levels] <nick | address> [type]
Removes the nick/address or the specified levels from nick/address.
If the user have no more access levels, it is removed from the user list.
[levels] - Access levels to remove.
<nick | address> - Nick or address to remove.
[type] - Lookup the address using this type of address.
; Removes 'Nick' from the user list /ruser Nick ; Removes access levels 1,2 and 3 from 'Nick' /ruser 1,2,3 Nick