Just beating Extreme (Challenge 3) in Super Challenge Battle and got Omegamid ..
The key for win the challenge:
1. i need 3 stun absorber
2. i need 2 protector killer (espescially to kill aegis dragon)
3. 100% luck, Rhynorunt kill Mechaviatan (with death roulette), and then blast the monster that killed him = 2 monsters down
4. Ziberius used Death Roulette and kill himself
5. Don't let Wraithcaptain's clone make another clone
6. i have Motordragon-Galliodragon-Subliathan Combo (they killed 4 monsters)
7. the most important thing for me: Last Biter = The Godfeather
Good luck for you all, i wish we all keep enjoying this game....