Commands are entered into the chat. They're preceded by either a slash (/) or hash (#). Unambiguous abbreviations can be used in place of full commands, e.g. /w instead of /who.
/help - list available commands
A /helpplayer
A /helpclan
A /password [new password] - change password
A /ipplayer [default = no sort / 2 = rank sort / 3 = age sort] - change password
A /refreshalts [all / name] - refresh another character without logging them in
A /showloc
/lag [seconds] - how long until lag turns you temporarily invulnerable
/spellignore - attack in response to spell attack
/fightback - attack in response to physical attack
A /surround - surround-hit
A /surrcomp - ghost companion's surround-hit
A /nextleft - attack left next
A /nextright - attack rightnext
/follow [player / self]
A /gctome - whether your ghost companion will travel with you via portals, ladders, etc
A /spelloverride - ignore spell interference when casting on yourself
A /allowlight - allow others to cast light on you
A /waypoint [default = list / number] - change password
/emote or /me - speak about yourself in third-person
/wave
/bow
/shout [message] - send a message visible by all
/tell [player] [message] - send a private message
/grtell [message] - send a message to your group
A /ttell [message] - send a message to your team
A /live [message] - send a message to the live quest channel
/noshout - disable hearing shouts
/notell - disable hearing tells
/ignore [player] - 'soft' ignore player
A /iignore [player] - 'hard' ignore player
/resetignore - reset ignore list
A /silence - disable hearing NPCs
A /shownodeaths - hide deaths in your description
/afk [default = no message / message] - set away-from-keyboard status
/group [player] - form a group with another player
A /team [number] - set arena team number
/purple - join the Purple One (when in the Purple Temple)
/skua - renounce the Purple One
A /clans - list clans
A /clwhen [number]
A /clwho [number]
/who - list online players
/seen [player] - how long since a player was online
/allow [player] - grant access to your grave to another player
A /transfer [player] - send item on the cursor to an offline alt
A /trade [command] - trade menu
/gold [amount] - put an amount of gold on the cursor
/balance - bank balance
/deposit [amount] - deposit gold at a bank
/withdraw [amount] - withdraw gold from a bank
/depot - open the item depot at the bank
A /sort [default = normal order / sort order] - sort inventory
A /sortdepot [default = normal order / sort order] - sort the item depot
A /sortpdepot [default = normal order / sort order] - sort the personal depot
A /sortall - sort the inventory, depot, and personal depot all at once
A /sorthelp [opt?] - list sort options
A /switch [default = switch to equipment set / 0 - 15] - switch equipment set or assign item to set
A /use [item name]
A /garbage - destroy item held on the cursor
A /rings [number] - list significant rings
A /amulet [number] - list significant amulets
A /armour [number] - list significant chest armour
A /belt [number] - list significant belts
A /hand [default = short list / 1 = detail / 2 = detail special items ] - list significant hand armour
A /shield [number] - list significant shields
A /karate [number] - list significant karate equipment
A /axe [number] - list significant axes
A /dagger [number] - list significant daggers
A /sword [number] - list significant swords
A /th [number] - list significant two-handed swords
A /staff [number] - list significant staves
A /wand [number] - list significant wands
A /champion [number] - list significant champion weapons
A /ranks - list all ranks and their required experience points
A /rank - experience points required for next rank
A /listskills - list all skills in the game and their modifying attributes
A /max - list your stats, their base and maximum values, and experience points required to max them
A /remove [stat]
A /spells - list active spells and related
A /firstkill [page number]
A /explor [page number] - list remaining exploration points
A /data - list remaining quests, highest completed labyrinth and castle quest
A /pqlist - active player quests
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A /pent - the number of activated pentagrams needed to solve this round
A /countportal - list active special portals
A /mlotto - monster lotto
/time - the in-game time
A /moon - the same as /time but also how long until the next special moon