Invokes an immense lightning storm, dealing extremely high energy damage on a total of 85 squares around the caster. The spell deals about 5-10% less damage than Hell's Core, but its area of effect is larger. Casting this spell puts ALL combat spells on a 4-second cooldown.
This spell, together with Hell's Core, replaced the old Ultimate Explosion spell in the Winter Update 2007. Rage of the Skies is considered to be more useful overall, due to dealing virtually equal damage, while costing almost 50% less mana and the fact that many high-levelled monsters are immune to fire damage. Rage of the Skies is the sorcerer's equivalent of the druid's Wrath of Nature, compared to which it has a smaller area of effect, but deals about 10% more damage and costs 100 mana less.
Prior to the Vocation Adjustments Update, Sorcerers could use either Rage of the Skies OR Hell's Core. If the player had learned both, they could switch between them by speaking to Zoltan and paying 500 gp.
In the past, this spell used to have a different animation: