Team Lanterns vs Team Thanos
Black Lantern: Kal-L
White Lantern: Sinestro
Yellow Lantern: Mongul (only 1 yellow ring)
Red Lantern: Atrocitus
Orange Lantern: Lar Freeze
Indigo Lantern: Indigo 1
Blue Lantern: Hal Jordan
Green Lantern: Sodam Yat (no Ion)
Violet Lantern: Fatality
VS
Thanos (Thanos Imperative version)
Thanos (Blood and Thunder version)
5 Thanosi (each having either the Power, Soul, Space, Time, or mind gem)
Scenario #1: Team Thanos gets no prep.
Scenario #2: Team Thanos gets up to a full week to prep.
Scenario #3: Same as scenario 1 except now Mongul has his 6 yellow rings, and Yat can access Ion.
Battle field: Thanos' Sanctuary
*No one on team Thanos is allowed to commandeer all six Infinite Gems for themselves to complete the Infinity Gauntlet.