Lodestone

[Conjuration] [Earth]
Level: [Nature 4]
Components: [S], [V], and [M]
Casting Time: 1 Standard action
Range: Close (25 ft. + 5 ft. per 2 CL) @{close_range} ft.
Effect: 1 Lodestone
Duration: 1 round per CL; concentration up to @{cl} rounds; concentration
Saving Throw: None
Spell Resistance: Yes

Material Component: A natural magnet of any size

This spell will create a lodestone that takes up a 5 ft. square and is about 3 ft. tall. In a 40 ft. radius around this stone, all creatures who are wearing any metallic armor: chain or plate, move at half their base movement speed, no faster than 15 ft. Creatures with weapons that are more than 50% made of metal can only make one attack per round. Any ammunition that is 50% or more metal will instead be diverted to and stick to the surface of the lodestone.

VTT Macro Description:
@{character_name} creates a lodestone that takes up 1 square. In a 40 ft. radius, all creatures wearing metallic armor move at half their base movement speed, no faster than 15 ft. Creatures with weapons that are more than 50% made of metal can only make one attack per round. Any ammunition that is 50% or more metal will instead fly and stick to the lodestone.