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The patch deployed yesterday on live realms updated the tooltips of most spells hotfixed in the past days, time for a little comparison!

Quote from Blizzard staff
Make sure you check the Recent In-Game Fixes - September 2009 for more details on this changes.

Faction Champions (Damage reduced in 10 and 25-man normal modes)

•Vampiric Touch - Causes 12375 Shadow damage over 15 sec to your target. (Down from 20250 damage)
•Arcane Blast - Blasts the target with energy, dealing 6013 to 6987 Arcane damage. (Down from 7863 to 9137 damage)
•Arcane Barrage  now deals 4750 to 5250 Arcane damage. (Down from 6650 to 7350 damage)
•Unstable Affliction now deals 11565 damage over 15 sec (Down from 13875) and causes 20817 to 24183 damage if dispelled. (Down from 24975 to 29025 damage)
•Hellfire now deals 2500 fire damage to all nerby enemies every 1 sec. (Down from 5500 damage)
•Explosive Shot now deals 1813 to 2187 Fire damage. (Down from 3173 to 3827 Fire damage)
•Aimed Shot now increases ranged damage by 1750. (Down from 3000)
•Eviscerate now causes 4375 to 5625 Physical damage. (Down from 5688 to 7312 Physical damage)
•Judgement of Command now causes 3325 to 3675 Holy damage. (Down from 4750 to 5250 Holy damage)

Twins Valkyrs

•Twin's Pact - The Twin's Pact heals for 50% of their total HP. (Up from 20%)

Koralon the Flame Watcher

•Burning Breath now has a 6 sec cooldown to prevent him from casting it immediately after Blazing Embers.