hi,
I'm not sure this will help you, as I don't know the game Legend.
Though, as you loved Titan Quest and it's abilities diversity, you should definitely give Sacred 2 a try.
Here is a link to the Sacred 2 demo (huge file, 1,7 Gb) :
Link
There is another hack'n slash game I've really enjoyed too that has a huge amount of abilities/spells : Silverfall and it's add-on Earth Awakening (a must have if you liked Silverfall, imho) .
This game's publisher has just released a pack that includes both.
I don't know if it's available in USA, but here in France it costs 30 euros (40 dollars).
In this game, you have all the "classics" (the ones you named), and a lot more :
combat arts/powers, nature/technology powers, elemental spells (fire, ice, water, air), divine spells (light, darkness), etc.
with the add-on, you get a new "campaign" with new territories and the ability to craft your own weapons and clothes.
HI-
I love Titan Quest too and The Witcher, but right now I am playing this game and just loving it. Did not have the first one so have ordered it.
maggie