What if there was a tiamat hydra upgrade that behaved like a melee runaans

In the sense that the flared damage does reduced %AD to you non primary target, but does full ST on-hit to the other units on top of the primary, while not interacting with the passive counter for rageblade. And as a hydra item it wont allow for the days back into the devourer builds of jungle item plus titanic into full tank hard carry since you can't stack the different hydra items together. Although technically it would be possible to mimic the devourer+rageblade(when it had aoe) build it would be drastically more expensive (a little over 2000 gold more) so the 2 item spike would be delayed.