Ice Magic

Ice magic is a unique manifestation of both water and heat essence magic wielded with full control only by Johann. While heat and liquid aliqesh (see essence above) have had some success in manifesting ice through spells, along with a few alchemists, the addition and subtraction working in tandem cause quite a few complications.

Effect

In general, the effect of the magic is to shape ice into whatever the user desires. This can range from offense to defense to non-combat related applications. Long or flat shapes are the simplest to manifest. However, intricate designs can be achieves through practice and focus.

Manifestation

When activated, the spell will produce ice in whatever form the caster wants and is powerful enough to wield. The complexities of the spell are due to the simultaneous use of liquid and heat. As such, only aliq-esh who are attuned to both can use it alone. A hydr-esh and pyr-esh could work together to  produce ice as well. 
Specifically, the cause of the difficulty is the fact that one essence is removed while the other is gathered. Removing or gathering both is much easier than trying to do one and the other. Water is collected while the heat from it and the surrounding area are removed, causing the water to freeze into a given shape. Weaker casters can only use liquid water, but more experienced ones are able to pull water vapor from the air and solidify it without a liquid source.

Source

The source of the spell involves a combination of heat and liquid magic.

Effect Casting Time

The spell can be cast very quickly, but larger objects take longer to manifest

Applied Restriction

Extremely dry or hot environments make the casting much more difficult. If there is very little liquid around, there is nothing for the caster to gather. Removing heat in a hot environment also takes more energy.