DragonNest Dark Tower Magic Institute boss fight (Abyss)

2 player, level 19 priest (me) and level 18 engineer manage to clear this dungeon in abyss mode.

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(Priest build)
Magic Skills:
Shield Blow lvl 1
Lightning Strike lvl 1
Divine Combo lvl 1
Charge Bolt lvl 3
Holy Bolt lvl 1
Heal lvl 1
Block lvl 2
Lightning Bolt lvl 1
Lightning Relic lvl 1

Physical Skills:
Dive Kick lvl 1
Counter Blow lvl 1
Aerial Evasion lvl 1
Sliding Step lvl 1
Wand Mastery lvl 1

Weapon:
+6 Belief Wand