The antigravity addons, summon AntiGravity.AntiGravityPlatform and summon AntiGravity.AntiGravityGear
These reduce a player's gravity artificially, just get the gear or simply jump from the platform without using air control and you'll be able to fly way high while others can't.
The antigravity platform can be destroyed.
The platform contains informative code about creating an external collision hull that forwards damage to the platform pawn.