Defeating Heigou is really hard and takes a long time if you don't have the proper
equipment.This equipment combo is best for various(Note:You need the Faustin blade for
this)
Knightly armor:Anti poison(for when heigou summons the skull that gives you all bad status
conditions)
              
              :Anti evil
              :Hex proof

Faustin blade:Essence burn(for when heigou summons the skull which gives him all good
status conditions)
             
             :Jagged edge(for extra damage)
             :Vampire fang(so you don't exhaust your supplies as quick)

As well as good armor and weapons,you will need good items.Assign these items to your
quickshot menu:Luster brew
              :Soul nectar
              :Healing elixer
              :Spirit exilir
(You can also keep other items in case these run out)

Facing Heigou:
Heigou uses various combo melee attacks as well as various "skill strikes"(I
don't know what these attacks are really called).Here are the "skill
strikes"(Note:These are in a random order):

1)(Commonly used)Heigou summons 2 copies of himself which attack you as well ash he
does(Its good to use Will of the sword(Skill strike) or Sword of Ashuran(Spirit strike)
for this situation.

2)(Commonly used)Heigou raises his hand into the air and a sort of red star forms.A skull
emerges from the ground,giving Heigou Boost,Haste,Protect and Regen.If the skull hits you,
you take damage and get Weaken,Slow,Curse and Poison.Heigou doesn't do anything as lons as
the skull is still around.

3)(Very rarely used)Heigou looks for the 2 clones to come,but they don't,so he strikes you
down,leaving you with 1 HP(and maybe 1 SP).After he strikes you down he does this wierd
pose for a few seconds.During this time he lets you heal,but he is invincible.

4)(Between commonly and rarely used,leaning towards commonly but not entirely)Heigou slows
down time,making him fast,(without Haste) and making you slow,(without Slow).During this
time he does HUGE damage and can break through your shield(Use your shield purely for
dodging, as running wont do any good)

Tips:1)Heal when health is low.SP is not too important.
    :2)When heigou just finishes doing a melee combo, attack with a counter-combo.Best
combo is A,A,X + X + X + X(Or 1,1,2, + 2 + 2 + 2 if you have Sudeki on PC). He recoils
after you finish doing this combo (ONLY THIS COMBO!) so you can do it again,and again if
you have good reflexes.
    :3)When he slows time,you can use Geyser charge(that 1 where he says"The earth
and you shall feel my rage!).

Now you know how to do it,hop to it!