Demon/Trial

Demon
Trial requirement	Demon evolved to 5 stars and equipped with a certificate.
Trial reward	Demon's Pearl x3, Pharaoh's fragment x5, Energy Crystal of Kreios (LV.450) x1
Pearl Cost	10× Demon 1× Pharaoh
Statue Cost	60 Soul Crystal 3x Oceanus (Lv. 210) 2x Mnemosyne (Lv. 300) 3x Kreios (Lv. 450)
Statue Bonus	Attack+2, Power+4 In Sky and Space, Speed+5 Lower Clone Capacity+6

• Forge horn
• Learn title : Magic Apprentice > Black Mage x2 > Wizard
• Meteor Shower > Angel
• fireball & skill > assassin
• skill > Crab
• use soul from assassin (stone skin)
• fire ball & skill > Little fairy
• Use soul from Fairy
• Use soul from Crab
• skill > Bandit
• Use Meteor Shower
• use soul from Bandit
• Attack until Boss die WIN!

Alternative solution 1:

• Forge horn
• Learn title : Magic Apprentice > Black Mage x2 > Wizard
• Meteor Shower > Angel
• Skill > Crab
• Use soul from Crab (group icicle)
• Skill > Assassin
• Unequip horn
• Attack bandit
• Equip horn
• Skill > Fairy
• Skill > Bandit
• Use soul from Fairy
• Meteor Shower
• Unequip horn
• Fireball
• Equip horn
• Use soul from Bandit (blade of ruin)
• Attack x 8
• Use soul from Assassin (stone skin)
• Fireball until Boss dies

Alternative solution 2:

• Forge horn
• Learn title : Magic Apprentice > Black Mage x2 > Wizard
• Meteor Shower > Angel
• Fireball > Assassin
• Skill > Assassin
• Fireball > Fairy
• Unequip Horn
• Use soul from Assassin (stone skin)
• Equip Horn
• Skill > Fairy
• Meteor > Bandit
• Skill > Bandit
• Skill > Crab
• Unequip Horn
• Use soul from Fairy 
• Equip Horn
• Use soul from Bandit (blade of ruin)
• Attack until Boss counter 1
• Unequip Horn
• Attack once
• Equip Horn
• Attak until blade of ruin ends
• Use soul from Crab (group icicle)
• Fireball until Boss dies

Alternative solution 3: (Thanks to Red who posted this on the in-game comments and it worked for me)

• Learn title : Magic Apprentice > Black Mage x2 > Wizard
• Forge horn and equip it
• Meteor Shower > Assassin
• Meteor Shower and use skill > Bandit
• Use soul (Blade of ruin)
• Unequip Horn
• Hit the Boss X8
• Equip Horn
• Skill > Crab
• Use soul (Icicle)
• Ignore Angel
• Fireball until Boss dies