Bad news...
I spent 4 hours for killing...
In ONE GAME I killed all super unique bosses, bosses...
Spent hours for searching those prickshits like Icehawk Riftwing, Ancient Kaa the Soulless, Pitspawn Fouldog, Frozenstein, Dac Farren, Eyeback the Unleashed, Sharptooth Slayer, Snapchip Shatter, hardly zerking in Chaos Sanctuary... I killed everything, EVERYTHING what could be call boss (Andy, Duriel, Meph, Dia, Baal), mini-boss (Countess, Griswold, The Smith, Summoner, all council members, Izu, Hephasto, Nihlathak, Shenk, Ancients etc...), pseudo-boss -
A_L_L super unique bosses which u can find at Arreat Summit...
ALL that in one game and holding SoH in inventory all the time.
Nothing... I expected that...
After all I tried sum strange things like visiting Den of Evil once again, trying to do something on Arreat Summit//Hellforge, trying to talk to Tyrael
(strange? he said nothing), Hadriel
(just like Tyrael), leaving one SoH in Den and second at Throne//Worldstone Chamber//Chaos Sanctuary...
I got only few ideas left...
1st - maybe one SoH must be left at every (dead) super unique
2nd - maybe SoH is that famous Relic wich has Baal stolen to bypass the Ancients when entering Worldstone Keep (I tried to talk to sum1 in Harrogath, try to leave it to Ancients but much possibilities yet of course)
I am sorry that you spent so much time checking those hypothesises (what is the plural of hypothesis?) But the Relic that Baal has that allows him to bypass the Ancients is his own soulstone (I dont know how that gets him past, but it does) You know this because Baal disguises himself as Tyrael and Marius (the guy that took the soulstone of Tal Rasha, therfore releasing baal into the world, and he was supposed to go through the Infernal Gate but didn't, so he couldnt reach hell, and therefore couldnt destroy the soulstone.) gives the soulstone to who he thinks is Tyrael who will make it all better, but it is actually Baal. (If you don't believe me on any part of this, watch the cinematics again) But, I dont want to take attention away from the Arreat Summit, or draw attention to it. I still have no idea that sticks out in my mind of what a possible use for the SoH would be, or how to activate, or use, or do something with it.