Lifesteal

Main Page: http://pastebin.com/Hf6CGtjA

Bloodletter [700]
Quantum Spade (325)
+10 Weapon Damage, +10% Lifesteal

Eternity [4600] (Doesn't do anything)
Bloodletter (700) + Runic Gavel (1175) + Nerazim Dagger (2000)
+47 Agility, +15% Cooldown Reduction, +40 Weapon Damage, +15% Lifesteal, +3% Spell Leech
[Active] Deal 200 (+40% Weapon Damage) Spell Damage to enemies in a 3-unit area and Stun then for 1 second.  You gain Health equal to 50% of the damage dealt.  18 second cooldown.

Darwin's Might [4300]
Flesh Hammer (2000) + Bloodletter (700) x2
+45 Strength, +25 Weapon Damage, +25% Lifesteal
[ACTIVE] +100% Lifesteal for 4 seconds. 20 second cooldown.

Sunflare Gun [4300]
Flare Gun (1100) + Kinetic Cell (1000) + Higgs-Boson Capacitor (2000)
+65 Intelligence, +700 Energy, +3% Spell Leech
[OVERCHARGE] Each time you use an ability, you gain +4 Maximum Energy, up to +600 Energy.
[ACTIVE: INCINERATE] Deals 200 [+20% of your Maximum Energy] Spell Damage to the target enemy. 60 second cooldown.