Cryomancer

Overview
Cryomancer is a CC focused Support who disrupts and slows enemies. Its best known utility is Ice Wall, which can block the path of both fleeing and pursing enemies alike.

Cryomancer is at its strongest after building enough cooldown to repeatedly dish out its CC. However, it shouldn't be underestimated during the early game either, as a well-timed Ice Coffin can easily lead to a kill. Despite being regarded as a C Tier class, its CC potential is highly valued and it's not uncommon to see Cryomancer being picked in the competitive scene to counter certain team compositions.

Synergy
The combo of Cryomancer's Ice Wall and Trickshooter's Trickshot is a well-known meme, where Ice Wall is used bounce the Trickshot for extra damage. It sounds strong on paper, but it requires pitch-perfect accuracy and can't be used in every situation. As such, it's usually not worth picking the two classes together just for this combo.

In the Novel
When Julia was first introduced, she lousily played Support Cryomancer for Lars's Trickshooter. She played too safe by staying far away from her enemies, failing to utilize Frostbite for its main purpose in the early game: slowing down the enemy Carry. In addition, she overvalued Cryo-Freeze and thought it was fine that Lars fought 1v2 as long as she could could heal him later with Cryo-Freeze. She failed to consider that the enemy could easily retreat while Lars healed up, a common newbie mistake.

On the other, Lars put Julia's Ice Walls to great use by showing the true potential of Ice Wall + Trickshot. Rather than shooting at the ice wall, Lars fired Trickshot at a normal wall, from which the bullet bounced into an ice wall and then bounced at the target, dealing triple damage.