Level 70

This is the seventh boss on the Adventure Map. The boss is Nebotus.

Strategy
Nebotus may be the worst legendary in the game, but his stats in this level are extremely high. He has almost double the health, 1.5 times the power and the same speed as the Beefcake in the miniboss level. For some reason, he spares you in this stage and spams Purge, which still does about 1500 damage assuming your monsters are at level 40.

Strategy 1
Monsters: Arch Knight, Lord of the Atlantis, Goldfield

Moves: Arch Knight needs one AoE move and as many high damage moves as possible (and Protection Aura if you feel like the enemy waves shred too quickly). LOTA needs Blessed Water and Energetic Water.

Runes: 3 Team Speed on LOTA and Goldfield, 3 Strength on Arch Knight

What to do:

Arch Knight shouldn't do anything besides Protection Aura if he is running it, and he should only do it once since the move costs 50 stamina. Let LOTA apply Damage Boost and Double Damage on Arch Knight. Goldfield can make the process quicker. Now Arch Knight has Damage Boost and Double Damage which majorly increases his attack power. Now let him kill the Utochomps and the Shankies in the second wave. By the time you reach the final wave, make sure Arch Knight still has Damage Boost and Double Damage. If Arch Knight has a power stat of at least 3686, has both of the buffs available and uses God's Will on the boss, the boss should die in one hit. If he doesn't, don't worry. You can run Spectrun Ray's after God's Will for a ton of damage.

Strategy 2 (ft. Hellberus)
Monsters: Goldfield, Hellberus, a monster who can stun or remove 100% of stamina

Moves: Hellberus needs mostly Fire moves, one move that deals raw damage and one move that applies Nightmares

Runes: 3 Speed on the third monster, 3 Strength on Hellberus and 3 Team Speed on Goldfield

What to do:

Kill 2 of the Utochomps in the first wave. Leave the third one at low health by letting Hellberus use his raw damage move. Multibite is a good move to use since it will be weak against Utochomp, which means Utochomp can survive despite Hellberus having high power. Now let Goldfield spam Life Channeling and do nothing until Hellberus gets his special. Now preserve Hellberus's special for the boss fight. Try and kill the Shankies now. You can let Hellberus apply Nightmares and Burn to all of the Shankies so that they die within a few turns. Now for the boss fight. Let your third monster deny the Nebotus. He should recharge. Now let Hellberus use his special. This should give Nebotus only three turns left before death. Now just keep your team alive for as long as possible until Nebotus dies.