King Solomon's Mine (Difficult)
Chart for Solomon's Mine Difficult Here: http://i.imgur.com/beRzsjk.png
To beat this dungeon, you need an Auto-healer capable of healing 3600ish health per round, and at least 8-9K health at a minimum. On most levels, if you can take out one heavy hitter, or make sure the monsters are de-synched (aren't on the same attack cooldowns), you should be fine.
...If you have over 12,000 health (around 12,500), you can auto-spin to victory.
[Values may vary... I only know what I have documented from running the Difficult mine twice, so numbers have been rounded to the next highest hundred as a buffer, just to be on the safe side]
Level 1
This level should pose no difficulty... try to stall out for all of your shooter skills by placing minimum bet.
Level 2
This is the only big threat with an 8-9K health team. Even with an auto-healer healing 3600 per round, You will die after round 5 unless you have just over 12,000 HP (12,200). Use a shooter to kill one of the Frost Golems to ensure survival, then stall to max skills again.
Blue Golem - 4800 dmg - [Cooldown: 4]
Blue Golem - 4800 dmg - [Cooldown: 4]
Blue Warrior - 3000 dmg - [Cooldown: 5]
Red Warrior - 3200 dmg - [Cooldown: 5]
Level 3
Green Skeleton - 2300 dmg - [Cooldown: 6]
Green Warrior - 3100 dmg - [Cooldown: 5]
Red Zombie - 2500 dmg - [Cooldown: 6]
Green Fairy - 1200 dmg - [Cooldown: 0]
Level 4
Green Crocodile - 1300 dmg - [Cooldown: 4]
Blue Spider - 1200 dmg - [Cooldown: 3]
Red Parrot - 1400 dmg - [Cooldown: 4]
Level 5
Red Fairy - 1200 dmg - [Cooldown: 0]
Red Golem - 4800 dmg - [Cooldown: 3]
Blue Fairy - 1200 dmg - [Cooldown: 0]
Level 6
Red Warrior - 3200 dmg - [Cooldown: 4]
Blue Skeleton - 2200 dmg - [Cooldown: 6]
Blue Skeleton - 2200 dmg - [Cooldown: 6]
Red Warrior - 3200 dmg - [Cooldown: 4]
Level 7
With 8-9K health and an 3.5K auto-healer, this should be no issue...
Green Warrior - 3100 dmg - [Cooldown: 5]
Green Fairy - 1200 dmg - [Cooldown: 0]
Blue Warrior - 3000 dmg - [Cooldown: 5]
Level 8
I would recommend taking out a Skeleton or the Fairy first, just to make sure all the cooldown timers don't line up so everything attacks you in one turn.
Blue Skeleton - 2200 dmg - [Cooldown: 6]
Red Zombie - 2500 dmg - [Cooldown: 4]
Green Skeleton - 2300 dmg - [Cooldown: 6]
Red Fairy - 1200 dmg - [Cooldown: 0]
Level 9
...again, just to be safe, use a shooter to take out the golem.
Blue Spider - 1200 dmg - [Cooldown: 2]
Green Crocodile - 1300 dmg - [Cooldown: 4]
Red Parrot - 1400 dmg - [Cooldown: 4]
Blue Golem - 4300 dmg - [Cooldown: 3]
Level 10 - Boss Level
This level is easier then it looks at first. After the initial cooldowns, all the enemies revert to a full cooldown of 7, which means that all the bosses will be permanently de-synched, which lets you auto-spin to victory.
Blue Shell Fairy - 4300 dmg - [Starting Cooldown: 3] ... [Cooldown: 7]
Green Tauron - 4000 dmg - [Starting Cooldown: 5] ... [Cooldown: 7]
Red Arachne - 4300 dmg - [Starting Cooldown: 7] ... [Cooldown: 7]
Congratulations, you just made 60,000 gold (+ Guild bonuses)
...rinse, repeat.