"If you have immunity to effects with a certain trait (such as death effects, poison, or disease), you are unaffected by effects with that trait. Often, an effect both has a trait and deals that type of damage (such as a lightning bolt spell). In these cases, the immunity applies to the effect corresponding to the trait, not just the damage. However, some complex effects might have parts that affect you even if you’re immune to one of the effect’s traits; for instance, a spell that deals both fire and acid damage can still deal acid damage to you even if you’re immune to fire." - player core 408
Oozes are generally immune to Acid, and the Decaying rune (gm core 237) has both the void and acid traits. It only does void damage, but since it has the acid trait, are oozes immune to all the effects of the decaying rune? Just the persistent damage? Something else?
Thanks