The Legendary Gem, Zei’s Stone of Vengeance, boosts damage for every 10y distance the damage dealing object is from the target. On the PTR players were able to exploit this LGem by sticking a long DoT on the target and then leaving the level or portaling back to town, creating an infinite distance for infinite damage. That bug is no more, with a maximum distance of 50y (5x damage multiplier) and no more tricks for infinite distance.
That doesn’t answer all of the questions, though.
Say i was to cast multishot about 10 yards away from a mob, what happens if there are mobs further away? will they receive the ’10 yard damage’ or will they receive more?
Grimiku: The short version is that Zei’s Stone of Vengeance calculates it’s damage bonus per monster hit. So, if a player casts Multishot just once, then monsters farther away take would more damage than those that are closer.
If you’d like a more detailed explanation then I also recommend checking out Mikhail’s guide on YouTube: Diablo 3 RoS – Legendary Gem – Zei’s Stone of Vengeance Explained.
This gem sounds really good in description, but it’s actually pretty junk for most builds, since it doesn’t work well with pets or minions. The Rank 25 special stun effect doesn’t trigger from attacks by pets, and the damage increase is from the source of the damage. Thus sentries or WD minions don’t get any damage increase if they’re right next to the target, and they won’t stun it either.
We’ve linked to some of Meathead Mikhael’s Legendary Gem tutorials before, and this one is useful as well. Click through for the embedded vid.