(* I do notice that the gear list
does include a Signet Ring of the Earth, which has Corrosion/Impulse/Combustion spellpower, so possibly one or more of those.** Wall of Fire is a popular favorite (or Well of Acid), as even with terrible DC's mobs will take ~half~ damage (if non-evasion) each time they are kited through that area. Similarly, Chain Missiles can be handy and have no DC. Very ymmv, though I would emphasize that you take no DC-based CC spells - they tend to be all-or-nothing, and those DC's will suck. (perhaps a few w/ no DC involved, such as Waves of Fatigue/etc.) Play with the non-DC options and pick your favorites - you'll have ample spell slots and power.)
(** Altho' it's also possible that that ring is just the best fit to fill the "set bonus", and the spellpower isn't that useful? It would take a detailed study of the vids to tell.)