Lord of Heroes: Dark Johan/ 11 - 12 Extreme Difficulty (No Sap/Low Level/Non fully upgraded Heroes) 

That was quite a challenge.Even though I'm using paid heroes (such as D Luci and L Alev), everybody knows how problematic is to fight DJohan without sap/poison. It was harsh but I actually made it.
These 17 minutes were filled with terror and angst. Almost everytime my L Alev got instakilled since mine is so weak. The only max leveled character is WVanessa (for obvious reasons), however her skills are far from max level :'). Also, confusion is your best friend in this fight.
Equipment:
D Luci: 2 DEF 2 HP 1 ATK 1 SPD (3 S3 Relics + 1 S1 Relic)
W Vanessa: 3 DEF 3 HP
L Alev: 3 HP 2 DEF 1 SPD
F Fram: 3 DEF 2 HP 2 CRID
W Johan: 2 DEF 3 HP 1 SPD