[Taqwus]

To clarify, the Jade Emperor didn't have death magic, if memory serves; he used only Breath of Winter. Soul Vortex I mentioned because of its similar "hurt those nearby" effect.
'course, the same could hold for certain battle summons, hm -- notably fire elementals for their heat-radiating effect. That's somewhat more controllable, 'tho, as even the lesser elementals require gems now.