I, the Grand Sorcerer Alazam of the Guild of Arcanists, have invented a remarkable new spell! Using unique magical artifacts, I can create what I call 'living ice' - chunks of ice that grow and consume heat and magic as if they were alive.
Other, lesser cryomages can summon static ice to form barriers or spikes, but my ice is superior! My ice acts as plant life or fungus does - it will consistently absorb the heat from the room in order to grow. The cold will spread outwards, and the lump of ice will consistently grow in size.
This growth is very slow, however - at a rate of a few centimeters in an hour, and less in warmer environments. Very high temperatures such as fire will melt and 'kill' the ice permanently.
When the ice is entirely melted, it becomes inert water, yet large masses are difficult to melt as it absorbs heat.
Overall, the living ice behaves like a fungus which sucks up heat. It is not intelligent or sentient in any way. The growth happens in all directions equally, and any chunks taken from the mass will grow in the same way. Otherwise, this ice looks and has the same properties as the regular sort.
I am, I admit, slightly concerned about the possibility of living ice being left unsupervised, and eventually growing to an unstoppable size...
So then, remarkable though my power may be, I am unsure how to best apply it. What could be the best application for such a spell?
TLDR: There is a constantly expanding, freezing cold, ice-fungus which can only be stopped by fire. What can be usefully done with it?