This mod tweaks most of the master level spells to make them useful.
I decided to do this because I found myself using experts as my go-to spells even though I had the masters available.
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Details
Key: Single Hand Equipable (instead of default both hands) = SE Dualcast Enhanced (with appropriate perk) = DC Level X Default = base spell (before perks) now effects up to level X enemies
Alteration - no changes here (I think 22sec mass par. is a bit op as it stands)
Destruction - Light Storm (SE, DC, +5 base dmg per sec) Fire Storm (SE, DC, +25 base dmg across the board) Blizzard (SE, DC, +15 base dmg per sec, 5sec paralysis w/ deep freeze)
Conjuration - Dead Thrall - Level 99 Default
Note: I allowed the CK to auto-scale the magicka costs with the power increases, so you'll probably need enchanted armor to dual cast these.
I don't recommend dual casting separate master spells (eg. Mayhem in one hand, Harmony in the other), it works sometimes, but in most cases neither spell casts and your character stalls for a few seconds.