Orcs – discussion about the race.

Will everyone rush Chaos with Deadly Cold? Knights definitely won't... and it's not a given that it will be more useful for Necromancers than summoning or Darkness.

Knights have Vittorio and swordsmen with shields (although, seeing an Ice Elemental in the guild and a Chaos skill at level 5-6, they might consider it).
As for Necromancers... even before, if they saw an Ice Elemental in the guild, they would rush with Chaos, and not just against Engineers (Engineers hated them for this skill). Now, with the real risk of getting a rusher for 2-3 weeks and extremely limited levels and castle development, I'm sure they will rush that, especially since Orcs can retreat against Necromancers (although the probability of this happening in a rush is minimal), but they definitely won't rush Chaos.