House of Moons by K. D. Wentworth

Good

Paperback.

Haemas Tal, founder of the new and controversial
mindtalent training school called the House of Moons,
was no ordinary schoolmistress. She was also the
unofficial ambassador to the enigmatic aliens known
as Old Ones, and the sole initiate of the aliens'
dangerous timeways. And, under the protection of
the mind-shielded predators called silshas, Haemas
would never again have to know fear...
Until now. For Lord Chee, a bitter, impoverished lord,
wanted rich and beautiful Haemas Tal for himself—
along with control of the entire Highlands. And he had
discovered an ancient mind-control weapon that
could give him the power he craved.
Only Haemas knew the secret of Chee's weapon. And
only she could hope to stop him before he awoke the
ire of the disembodied Fourth Ones, the most
powerful of Desalaya's linked alien races-
and-the least forgiving...