I will update this build when paragon levels become available.
However there is one thing I'd recommend for players intending to use this or a similar build. I would drop extend spell and take one more favoured enemy instead, like Undead for example. Extend spell was mainly to give me a larger number of Frost and Bless Weapon spells, but you can achieve the same thing by just using a Blackguard augmenter with level 1 slots.
This frees one epic feat, and taking undead as favoured enemy makes this build slightly better for Elysium and Abyss.
Please note that I wouldn't drop extend spell on a strength lash, since extended death wards are too good to give up.