In Shax’s version of Demonic Obedience, it explicitly says that you gain +3d6 sneak attack and that it stacks with any pre-existing sneak attack dice you might have. In Fiendish Obedience it only says you gain +5d6. Does this still stack with pre-existing sneak attack or is it only RAW and doesn’t stack?
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That exalted boon from fiendish obedience says, "If you don’t already have the sneak attack ability, you gain sneak attack +5d6."
If you already have sneak attack from another source, you don't get the 5d6. It explicitly does not stack with pre-existing sneak attack damage.
The demonic obedience 3d6 boon explicitly does stack with your other sneak attack.