From LSWiki

Spoiler Warning

This page contains information which may be considered 'spoilers'. If you do not wish to have this information given to you, the best place to start the quest for information is with the Guilds page which is the output of 'help guilds' in game.

Joining the Red Magi

On the main Almerian map, at coordinates 23, -23 there is an exit downward into the Red Magi guildhall. Presumably the Red Magi live underground as it is close to the primal fire of the world's core -- otherwise I have no clue why they live in a cave.

the Red Magi guildhall [n, u]
    You see a wooden-framed white wooden bulletin board (updated 2 weeks ago) and Askeen the
Master Pyromancer.

If you are not a member of a guild, you may receive information on the Red Magi by typing 'help
red magi'.  If you wish to join the Order of the Red Magi, say 'pledge me to the Red Magi'.  To
leave it, say 'I renounce the Order of the Red Magi'.  Red Magi may say the command 'advance'.
Askeen's limbs are named head, chest, right arm, left arm, right hand, left hand, right leg, left
leg, right foot and left foot.  Askeen was created by Fixy; the source code was last updated Wed
Apr 25 21:32:48 2007.  The elf race was created by Lost Souls, who wishes to credit J.R.R.
Tolkien as inspiring this work; the source code was last updated Wed May 16 22:45:34 2007.

At the time of this page writing, 'help red magi' is broken and Askeen's info needs a bit of tweaking, but the important information is there. From testing Askeen speaks Sperethiel and Anglic for understanding joins/advances. I believe he would also understand Enochian and most likely Latin.

You say, "pledge me to the Red Magi" in lyrically-accented Anglic.
Askeen looks you over.

                    ,.   (   .      )        .      "
                   ("     )  )'     ,'        )  . (`     '`
                 .; )  ' (( (" )    ;(,     ((  (  ;)  "  )"
                 _"., ,._'_.,)_(..,( . )_  _' )_') (. _..( '..

                          Order of the Red Magi News


          The spells Summon Fire Spirit, Summon Fire Elemental, Sustain
          Fire Spirit, and Sustain Fire Elemental are now available.

                                              -- Chaos, February 1st 2007

          Changed Flezra's instructor patterns from "teach me" to "instruct me
          in".  Sorry if this screws up your aliases and what not, but got tired
          of spells vs. skills conflicts in her responses to 'Teach me x'.

                                               -- Xekrin, March 1st 2007

                              (  .      )
                          )           (              )
                                .  '   .   '  .  '  .
                       (    , )       (.   )  (   ',    )
                        .' ) ( . )    ,  ( ,     )   ( .
                     ). , ( .   (  ) ( , ')  .' (  ,    )
                    (_,) . ), ) _) _,')  (, ) '. )  ,. (' )
                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
You wear your tiny red linen robe around your body.
You are now a first-degree specialist in arcane focus, arcane lore, Enochian, evocation,
introspection, Latin, legerdemain, memory, prestidigitation, pyromancy, scholarship and
telesmatic weapon.
You are now a second-degree specialist in literacy.
You are now a third-degree specialist in centering and channeling.
Askeen smiles at you warmly.
Askeen gives you the red robe which symbolizes his status as a Red Mage.
Type 'help red magi' to receive information on your new abilities.