How do you use Doom knight

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I just found out how to use DoomKnight.
Good Techniques below!

For Good Mana Attacks:

Use first skill (Dark Siphon) and second skill (Soul Crush) over and over again, in that order.

For Better Mana Attacks (don't use all the time:

Use first skill (Dark Siphon) and last skill (Blood Offering)

When You are Low on Health:

Use third skill (Void Strike). It'll make you hit more damage.

NOTE:
Do not wait to use Void Strike! When you are losing health USE IT!!! It helps me get more health all the time.