Hmmm… I was going to follow KO´s advice and not add more to the collection of unvoted proposals, but I´ll post some fluff about that god, and see if you like it.
When something good happens, that´s good luck.
When something bad happens, that´s bad luck
When something totally unexpected happens, that´s Fate.
Orthar is Fate, the sovereign destiny, the many path of the future; not even other gods are above him. It´s an aloof being that rarely contacts with mortals or other deities.
Orthar is represented with many forms: a popular one is as a large spider with human head, spinning a chaotic web of many strands; when somebody is caught in an unexpected twist of fate, he´s said that “was caught in Othar´s web”. Also, when someone dies –specially if it was an unexpected death- it´s a popular saying that “Othar cut his string”. Other forms he´s associated with are women of varying age, or a halfling or gnome child; it´s common knowledge among adventurers that finding lone children frequently brings trouble.
Despite this frequent negative association with him, Othar isn´t a malevolent or mischievous god; only that´s he´s likely to be cursed when something bad hapens. His agenda isn´t know, and in fact it´s very probable that he hasn´t got one except maybe to defend the proper flow of events. This absolute neutrality and detachment makes him alike to a force of nature: if he´s a natural aspect, given form by believers, or a very powerful god, is a debate that´s not likely to be resolved soon.