| Chemlak |
Pathfinder Adventure Path, Lost Omens, Rulebook, Starfinder Roleplaying Game Subscriber
It's also implicit in the combat round rules:
Quote:
Effects that last a certain number of rounds end just before the same initiative count that they began on.
The implication is that the effects happen on the same initiative count, just before anything else.
For multiple effects, I'd let the character decide which happens first (for example, troll has taken 7 points of damage and has a 3 point bleed. He can choose to regen 5 (bringing him to 2 damage) and stop the bleed, or (if he's stupid), take the bleed first, and then regenerate, leaving him on 5 damage with the bleed stopped).