Calia Menethil: Light-created Undead, sister to Arthas, and one of several leaders of the Forsaken. In recent times, she's acted as something of an ambassador between the Forsaken and the Alliance, even helping to organize the reclamation of Gilneas. But can she be trusted?
When it first came out, the Horde's ending quest in the Reclaiming Gilneas storyline included an interesting slip that has caused many a raised eyebrow (that has occasionally immediately fallen off, these are Undead after all) — the quest's instructions told us to report to «Queen Calia».
When Calia was still worried that the Forsaken would ever accept her, she insisted that she had no intentions for the throne of Lordaeron. Now, several years into her leadership position on the Desolate Council, and having achieved her first stated goal of returning Gilneas to the Alliance more successfully than even she could possibly have imagined, could it be that Calia is secure enough in her position with the Forsaken to start eyeing the throne? At the very least, even though it has been changed, this instructional quest text may hint at Blizzard's own intentions for her character.
Obviously, the simple and most likely answer is no, this was a mistake, don't read too much into it. But where's the fun in that?
So for the sake of fun, I would like to propose a theory: Calia has been quietly working to claim the throne of Lordaeron since the start, and it's part of a larger conspiracy to claim the soul of Azeroth — not for the Titans, not for Death, not for the Void, but for the Light.
Let me explain.
On the surface, Calia's involvement in the reclamation of Gilneas is simple, but effective. Back at the end of the Return to Lordaeron storyline, having been appointed a member of the Desolate Council, Calia stated that the first order of business she would bring would be the withdrawal of Forsaken troops from Gilneas.