Rollers

The weapon type that is composed of weapons that lands on the ground and travel across it for some time. If a roller type weapon has already begun traversing across the ground and enters a portal at ground level, the weapon will instantly teleport to the ground below where it appears after appearing through the second portal.

Examples:
 * Roller
 * Back-Roller
 * Saw Blade
 * Minions
 * Dual-Roller
 * Train
 * ShockShell
 * Zipper