Magus Battle Royal.

Our competitors and the main reason why they're fought (NO MAGIC ALLOWED):

• Fluder Paradyne - If he win this battle Ainz will grant him new magic book.

• Khajiit – Will granted item that will transform him into Lich.

• Theo Rakheshir – Ainz grant him crystal that contain 8 tier spell.

• Thousand Leagues Astrologer – Will permanently forget about all what she saw in vol. 9

Due to Evileye advantage i make some additional condition: prep time 1 day, they all got info about each other.
EDIT: Evileye excluded. (Hope she get another chance to get date with Mighty Momon.)
Some more option:

1. Starting position, each one start at corners of 4km square.
2. Battleground will squeeze every 2 hours equally from all sides to the centre, if there no winner in 12 hours, they all will be squeezed to death.
3. They can choice weapon from: Dagger, Short Sword, Club and Staff.
4. One Yggdrasil healing potion placed in the centre of square.