| One thing about the illusiary double "rules", it should perhaps include something along the line that the double counts as the hexblade for the purposes of the mark. It kind of fits the hexblade as a defender to throw out a decoy, and giving the decoy the benefit of a mark seems to go against that. Also, the ongoing damage from the encounter power is a bit rare, the only other example (from the PHB anyway) is a wizard power that risks hitting allies.
Also, doubled assault seems a bit big for a level 1 encounter power. It likely could have both attacks at 1[W] and still be solid.
A couple minor things are formatting issues (the penalty of 2 to saving throws seem odd without it being -2, in addition to things likes save ends being bracketed).
Just a few suggestions. | 
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