We've decided that Winter Orb, Storm Brand, Bane and Soulrend were too powerful for clearing through content without heavy investment, so the damage and other aspects have been reduced in power.
Warlord’s Mark now only applies its leech bonus to attacks. The curse easily solved mana problems for casters with minimal investment, and after deliberation we've decided that solving mana problems for spellcasters should require more thought and a greater opportunity cost.
Herald of Agony has had its minion damage per Virulence reduced, as the skill provided a huge amount of power for very little passive investment.