I have two PCs in my group that are ready to become priests, one of Orlanth, the other of Lhankor Mhy. They both have been initiates of Elmal as well.
Both have asked whether they can become priests of both gods. I've told them they can get rune points and rune spells from Elmal (although he is not detailed in the book I someone did a terrific write up on the web) as initiates and also gave them access to the Oath rune spell as rune priests of an associated cult.
However, they would like to become full priests of both gods. One already meets the requirements, the other is very close. Do the rules permit this? How should I handle the tithing? Technically they are already giving 9/10 of their income to their respective cults and 1/10 to Elmal, though in practice I have not made them pay the tithe to the cult of Elmal yet. (They did the local cult a huge favor in game.) They cannot really pay 18/10ths of their income to two cults. Should I just have them pay 9/10 and rule it goes to the two cults somehow? Or maybe that it is not even possible, since their duties to their main cult requires so much of their time?
I'd like to say yes to the request. They have really thrown themselves into the Elmal storyline I gave them. And the third priest in the group, who worships Yinkin, is likely to ask for this in relation to Orlanth down the line.
If I missed a rule that addresses this, can someone point me to it? Or is it something that will be addressed in Gods of Glorantha when it comes out?