[Agema]

Niefel Jarls absolutely want the earth bless for +4 reinvig, it means you can possibly do away with needing +reinvig items (or alternatively use +reinvig items and cast Quicken Self). It also makes them much more active if you employ them as combat mages rather than thugs/SCs.

Regeneration is also brilliant. If you take damage, it makes you less likely to take an affliction. Further, if you use them as SCs they inevitably pick up a few cuts and bruises whilst single-handedly wading through the enemy. Just a small bit of regeneration stops lots of cuts and bruises adding up to death.

Finally, there's an item called Shroud of the Battle Saint. Put it on your Skratti with an E9N4-6 bless and change shape the Skratti into a Werewolf on the strategy map (don't use the battlefield command!) - you've now got another source of extremely lethal SCs. Yum.