Er, no. You know it could be that the person saying Oranyan isn't multiplicative is wrong, right?
Absolutely! When I tested Grio's +10 vs Oranyan myself, I had Oranyan giving me longer durations.
But then again I'm not a very "precise" type of person with this sort of things, and Twigberry usually is way more accurate than me. Which is why his statement struck me. If it came from anybody else I would've assumed he was just wrong.
I've asked for more testing exactely because I trust him, just like I trust you and other people over these boards.
I don't have a +10 Grio anymore, but given your screenshot I'm of course leaning to think Twig just unawaringly messed up something and that things are exactely as I always assumed them to be (Grio's addittive, Ora is multiplicative)
Anyway, Dunna+Ammurapi (16) was already better than Ora even if Ammurapi were addittive, now that we know Ammurapi is multiplicative, this makes such a combination of items even better.
Question: when in the formula is the Perpetuance bonus added?
We have Base Duration, Addittive Bonus from Telchine/Othersources, then Multiplicative bonus from Oranyan/Ammurapi/othersources.
When is the 2.55 bonus from Perpetuance applied in this flow?