I'm Looking for a little creative help in advancing a monster to an appropriate challenge for my campaign.
I want some help advancing the Rhu-Chalik on page 203 of Bestiary five.
Advance to CR 8, then add mythic ranks (4 MR) until it is CR 10.
I'd like for the advancement to be within the previously defined thematic and mechanical role of the monster.
It is important to note that for this encounter the Rhu-Chalik will be in service to and in physical proximity to the Mythic Aboleth on page 178 of Mythic Adventures.
What combinations of new spell-like abilities, mythic abilities do you think would work great for this abberant team?