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Out of 4 Encore Missions, I believe Cerberus is the hardest one. I've been on tier 6 for almost a week and I tried multiple team combination and I can't finish it not until I started reading the skill effects and tried this hunter team to finish tier 6 and here's why...
1) Seo Jiwoo: her skills are almost unlimited CD plus high breaking defense also main damager since recommended attribute is water
2) Lee Bora: Once you break the defense, use support skill (shift key in keyboard) for debuff, 15% increases damage taken effect then go back to your Seo Jiwoo to deal more damage
3) Lee Joohee: Seo Jiwoo using a lot of MP so we need some support who could recover her MP a lot. So Leo Joohee is better. Even if I have Min ByungGu (Support SSR), I will still choose Leo Joohee cuz Min ByungGu's support skill only apply debuff that increase damage taken by 15% but its useless when your main damager doesn't have MP