What does it mean when a raid is the pinnacle?

[worldly rampart]

Does it mean that you are able to continuously get rewards from each completion? Not sure.

[past helm]

If the raid is pinnacle, you can keep doing it to get the weapons, and the last encounter your first time will give you a pinnacle level weapon

[worldly rampart]

So in theory, if you were incredibly lucky you would be able to get constant red borders?

[raw flax]

red borders aren't tied to the drops being pinnacles

its just rng

and you only get pinnacle from every encounter from the latest raid for eg you get pinnacles from every encounter of RoN

but for rotator raids you get the pinnacle for completing the final encounter