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Yshari Visions of Anguish, Hatred, and Terror, and Baal. Uldy Radamant, Council Priest, and Andariel. Athulua (now casts standard teleport when she teleports instead of Sky Siege).
Replaced the "Vampire" AI (the one which annoyingly caused them to flee under 25% health) of all bosses that used it with our first new AI, which no longer causes them to run and cry in a corner when they are about to get smacked. The cooldown is usually 3-5 seconds, depending on the boss Bosses which teleport when struck now have a cooldown for doing so, allowing for a less interrupted and more enjoyable boss-killing experience. The player now gets full experience up to 5 levels under area level for all levels, reducing the likelihood of negative snowballing when falling behind exp curve. Target dummy now records damage from traps, trap-like skills and totems.
Any level of character or Follower can wear one.
There is no level requirement on the ring making it an ideal twink. Your Followers can wear a HR, but not two at a time. Initially during the RoS beta it was possible to wear an imported D3 version along with a new RoS version, but this was a bug. The HR is unique equipped so that each character can only wear one HR at a time, whether the D3 or the RoS type. It can be Salvaged to destroy it and retrieve a Fiery Brimstone (D3 ring) or Forgotten Soul (RoS version). The HR is account bound and can not be sold or traded.
Thus a Diablo 3 Hellfire Ring on a Follower is worth +7% Experience to the player, and a RoS HR is worth +9% Experience. Followers can equip the Hellfire Ring as well, but just as with Magic Find and Gold Find on followers, they only share 20% of the bonus experience to the player. The main perk of the ring is the substantial increase to Experience gain, and the goal for most players is to create a ring that’s got decent stats as well, so they’re not giving up too much DPS by using the Hellfire Ring instead of a Legendary or Rare ring.