Somehow a late-night conversation among the Gwaith-i-Mírdain turns onto the question of which is deadlier, ice or fire. Celebrimbor declines to support either side, since both are equally deadly: "Ice like the Helcaraxë, fire as dragonfire, or the chasm where my uncle met his end . . ."
Silmarillion - Celebrimbor & Annatar
"Which would you prefer?" Annatar asks, smiling.