The problem is, the Klaxxi sword is a One Hand sword, not a Main Hand. This makes it quite impossible to transmog the caster sword with an older caster sword.
...So I did a little look-see at the caster sword from Terrace of Endless Spring, and what do you know... Loshan, Terror Incarnate is a One Hand sword.
So, my question for discussion is: Why are these caster weapons not Main Hand? It kind of ruins the concept of transmogging 'similar items'. There are a few One Hand swords I can use, but how can I not want to throw Tempest of Chaos on with my Tier 5 lock set?