I noticed that the majority (I do not read everything) remains in the simple of the branches of light or nature. We go with some dark spells and difficult to use (I almost consider them my specialty when it comes to imagining them)
Macabre food: begins to tear pieces of meat to a unit in a minimum range of 50 (if there is none, it starts them to itself), for 5 seconds, causing 20 damage per second. When finished, create three consumable items (piece of meat), which when used heal 50 life each. If after 2 seconds of appearance the items are not consumed, they disappear. I recommend it with a ghoul or something like that.
Transformation macabre: Another of hero, preferably (although it works in units) Activable ability immolation style. It heals itself 100 points of impact per second, but subtracts 50 + 25 * seconds of mana per second (it would be 75/100/125/150, etc.) If the unit runs out of mana, its life points will be automatically reduce to 1.
Dark frenzy: Ultimate. Enter a temporary state in which each murder (yes, including allies, I love doing that) gives life equal to 30 * unit level killed (one level 10 gives 300 life)
That's all for now, but after I will bring more
Edit:
Survival orb. Summons an orb of poor health (200?) That heals a tenth of his current health every 0.5 sec. to any nearby allied unit.
Nameless: Counter spell of the known "black hole". It attracts allied units to the center of their area, curing more and more allied units depending on their position.
Dark union: Link the soul of the launcher with that of the target (ally or enemy, it can be useful to an enemy).
Cause 10 damage per second for 10 seconds to each unit, and at the end he heals both 350 life points. If one of the two units dies, the other will also die, and both will explode causing 100 damage to nearby, allied or enemy.
Rain of purity: In the selected area falls projectiles of sacred energy from the sky, in the form of 6 waves of 3 projectiles each. Each projectile heals 25 health points to the impacted units, and grants a buff that heals 5 health points for 3 seconds. The final result of this skill would be an antagonistic of rain of fire.
In a future, more...