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I while ago I decided to make the attempt of converting a thyrrus simply to see the results. After making one, I tried my hand at another, figuring I might make a small squad of three or five - design some rules for the squad as alien mercenaries that could be joined to another army. Well… the whole thing snowballed, so here is my codex:
http://www.dakkadakka.com/wiki/en/Grunt13’s%20Thyrrus%20Codex%20%28proposed%20codex%29