Leira

Leira (pronounced: LAIR-ah), also known as The Lady of Deception or The Lady of the Mists, was the goddess of deception and illusions and patroness of illusionists and liars. 

Personality

She was an enigma, never telling the truth when falsehood would do. Everything she did and said was shrouded in layers of illusion and lies. She believed that truth was worthless and that misbelief and falsehood were what gave life meaning.

Divine Realm

Leira maintained a divine realm called the Courts of Illusion on the chaotic plane of Limbo. After her demise, her body was adrift on the Astral Plane, like those of other dead powers.

Worshipers

Leira had quite a small following. Her priests, known as Leirans, or Worshipers of the Mistshadow, wore silver masks and often disguised themselves to deceive those around them. Leirans would speak the truth only to other Leirans. High-level clerics of the Leiran faith were called Mistcallers.

Every morning, and on every moonlit night, Leirans lay face down and prayed to the Lady of the Mists. If there was any mist, Leirans would walk through it and pray. The most revered act in the Leiran faith was the "Unmasking", a purification ritual performed when new followers entered the faith or if a follower changed rank. During the ritual, the follower would walk barefaced among its peers while the clergy would hold up candles and reflective surfaces.

The highest concentration of Leira's followers could be found on the island of Nimbral and its vassal state Samarach. While the people of Nimbral rebelled against the influence of Leira's clergy, Samarach was still held under the sway of those who believed her still alive and many of her follower's practices were still in place. 

Not widely worshiped, the majority of her worshipers were users of illusion magic. While Leira may have had few dedicated followers, a worshiper of the Faerune pathologean often would pay homage to her before an important decision or judgment.

Orders

Mistcallers

Specialty priests of Leira with limited powers of illusion, the Mistcallers were the clerical order most commonly associated with the church, though no one could be sure how many there were.

Mistwalkers

A sect of the church first appearing after the Time of Troubles, the Mistcallers continued to display the ability to cast divine magic, but were purposefully ambiguous about the "alleged" death of their goddess and whether their magic was granted by a living Leira or by Cyric.

Disclaimer: Not official. This is just what Leira looks like for my homebrewed campaign