Hell's Core

This spell, together with Rage of the Skies, replaced the old Ultimate Explosion spell in the Winter Update 2007. Hell's Core is considered to be less useful overall, due to dealing virtually equal damage, while costing almost twice as much mana and the fact that many high-levelled monsters are immune to fire damage. Hell's Core is the sorcerer's equivalent of the druid's Eternal Winter, compared to which it costs 50 mana more, but has a larger area of effect and deals about 10% more damage. Casting this spell puts ALL combat spells on a 4-second cooldown.