And even at the basic levels some of these things are somewhat flawed.

"+AoE"
-Area of effect is surgical. It would be like handing a doctor a sword and expecting him to do better.

"Necromancy = Poison"
-Earth is poison. Necromancy is unrelated to it.

"Assassin + Poison"
-So it increases a skill they don't particularly use... that Necromancy gives you resistance to... and that Earth actually uses.

"Water increases Water damage and resistance"
-One of the stronger aspects of the game is how cross-classing works. Water increasing healing amount regardless of what skillset uses it is a benefit. That said

"Warfare increases damage"
-I am not sure a universal physical damage increase is a good idea, it makes the skill essential for scoundrels, Archers, Warriors, and Necromancers (assuming they stick to physical)