I don't know what BloodElemental Primary attributes is, but below skill is fit if he/she primary attributes are Intelligence.
Blood Lust (Unit Target)
Sacrifice X% of your current HP to deals damage equivalent to HP scarified.
Each level reduce cost of sacrificed but deals more damages
Requiem (Area)
Absorb X HP of unit in X AoE, the absorbed HP then will be healed to nearby allies equivalent of total ammount HP absorbed/X
Each level reduce the division of healing power
Path of Blood (Passive)
Each X% HP lost will increases the power of BloodLust and Requiem.
For Example, if the bloodmage lost 20% of his HP, the BloodLust will deals more damage (Total Sacrified HP + (20% of BloodMage HP * Total Sacrified HP), and the requiem healing power will heals more (Absorbed HP / X + 20% of BloodMage HP / X )
Where * are Multiply
Blood Fury (Activate/Deactivate)
When Activate, BloodMage greatly gains movement speed and nearby allies attack's will LifeSteal, at cost of 1% HP of BloodMage each seconds.