Guardian of Darkness

Hints:
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The 3 most important spells are "Drain", "Heal", and 
"Blast Positive". You should always tune in these spells 
to the highest level possible in each chapter. You will 
learn "Drain" after mission 2. This spell will drain the 
energy to recharge your energy level.

The other powerful spell that you will master later on 
after chapter 6 is "Repell Energy". This spell could 
reflect all of the attacking spells from the enemies and 
make you immune from those spells.

You will learn a spell called "Called Spirit" on mission 4. 
This will invoke a friendly spirit (a powerful one) to help 
you fighting the entity. But after he destroy the entity, 
it will attack you until its time is up.

Find rooms that have the most energy level. Use "Drain" 
spell to recharge your energy level.

Don't start attacking the entity until it's necessary.