Level 35 prison of elders is all about the gjallarhorn. I'm a day one player and haven't gotten it to drop. It wouldn't be that big of a deal if everyone wasn't so caught up with finding someone with a gally.
I don't even care about the weapon but I don't have a group of friends that plays all the time so I play with randos. Finding groups gets real tough if you don't have a gjallarhorn. Then all you hear the whole time it's damn you're really screwing us man. When the guy who is saying that has died 35 times and I've died ten. All but one due to both my teammates dying.
-blam!-
Edit:
Had yet another guy just after finishing hard vault of glass tell me that I couldn't join him and another player because I didn't have gjallarhorn. Lol ridiculous.
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The mods are rotated each week so if you have thunder lord you'll be good next week.