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Salutations fellow dice-jockies! A friend of mine has recently decided that he wants to run a game set in Arcadia in good o'le Galorian. He wants us to be villains in the employ of a mythic black dragon. Ever the helpful PC I asked him what he needed, and his exact words were "An arcane cannon would be good".
After spending a week thinking about it, I got nowhere. I am tapped out of ideas, so I turn to you guys. What could I do to be one of Galorian's more sinister villains?
According to him, things like the Drow Noble are acceptable as first level characters. We're level 10, with two mythic tiers, and our stats are an array; 13, 14, 15, 16, 17, 18.
So far the party is comprised of...
A Graveknight
A Tiefling Bloodrager
An Android Alchemist (Vivisectionist)
And a Corpse Collector (Yes. Really.)
I'd thought about a Wizard/Cleric/Mystic Theurge, or some manner of blasting Sorcerer. What do you guys think?

I am passing the reins of DMhood off to a player in my Monday night group, and I want to go out with a bang, with a few memorable encounters designed to be both fun, challenging, and just plain wrong.

One such encounter involves the PCs ascending a tower to stop the assassination of their friend as he ascends to godhood. (It's gotten a little high powered.) They will come to a level of the tower that is little more than a steel-grate floor. The trap, when sprung, is a Shocking Floor Trap (+9 to attack, dealing 4d6 electrical damage each round for 1d6 rounds). What I want, ideally, is an enemy in the room that is bolstered by electricity, but I cannot for the life of me remember what creatures are.

The party consists of a Magus, a Summoner, a Rogue, and a Druid, each level 9, each with 3 mythic tiers, so they can handle some punishment. Does anyone have any suggestions?