Don't spend all your "Dark Essence" on one boss unit. A balanced army of five Level 3 units is almost always better than one Level 10 unit that can be "CC’d" (Crowd Controlled) by the Hero Mage. Conclusion
Every major boss fight in Hero Party Must Fall has three phases. Do not skip phases. Hero Party Must Fall Guide
Poison the well in the starting town. (Delay hero leveling by 3 days.) Mid-Game Goal: Capture the Cleric. Break their staff publicly. Boss Fight Priority: Mage > Cleric > Rogue > Warrior. Victory Condition: Not a corpse. A kneeling, weeping hero who begs for death. Don't spend all your "Dark Essence" on one boss unit
Keep multiple save files, especially before major decisions. Some players have reported game-breaking bugs related to fully maxing out the lust bar too quickly. Do not skip phases