This guild is fan fiction and in no way should be believed as official lore.
(Roleplayingwise) Arcana Solarie is an organization made by Anaerion Sunbough's father to protect the powerful artifacts of Silvermoon and of azeroth as a whole, from falling into the hands of those who would harm the whole of azeroth. It is unknown how many members are within but it is known they join the cause for the force of justice.
It is a guild of light RPers and Raiders, who progress in raiding at an average rate.
Initiate: Beginning rank
Sunsworn: Intermediate (Normal member.)
Sun guard: Honorary rank (Veteran player.)
Guild Archon: Manages parts of the guild as a mediator of sorts.
Treasure Warden: Master of the guildvault, usually chooses who should receive what.
Guild Master: The rank held by Anaerion Sunbough, runs all official guild activities also known as "Grand Magister."
Grand Magister: Anaerion Sunbough
Sun Guard: Mortothiar Lightblade
Guild Archon: Megid Sun Guard: Melzar Sun Guard: Anomalous Guild Master: Anaerion Sunbough Sun Guard: Pyrope Sindor'sin Sunsworn: Mortothiar Lightblade Sun Guard: Jungar Sunsworn: Grimwalker Guild Archon: Akutare Sunbough Guild Archon: Spoor Guild Archon: Kotek Sun Guard: Vries Sun Guard: Brolo Sun Guard: Solarion
(Not completely accurate.)