Multiple Legs

is a physical mutation that grants an extra feet slot, allowing the player to equip an additional pair of boots. It also increases Movement Speed by a mutation level based amount and carry capacity by a mutation level based percentage.

The extra feet slot doesn't grant the player an advantage in the way of gaining additional AV and DV from wearing extra armor, as these values as will be averaged across both pairs of feet, effectively halving them. This means the player will need to wear two pairs of the same boots to gain the same AV and DV as normal. This property does not apply to other bonuses granted by footwear, such as the Movement Speed granted by wearing.

Formulas
The following formulas are used to determine movement and carry capacity bonuses based on mutation level.

Advantages

 * Grants extra Movement Speed, making running away a far more effective strategy
 * At higher levels, intentionally contracting ironshank can be a viable means to improve AV without overly compromising mobility
 * Allows wearing multiple footwear items, which can grant even more movement speed (or other bonuses)
 * Allows the player to more effectively kite enemies
 * Grants extra carrying capacity without taking up any slots, unlike or similar items

Disadvantages

 * Very high cost at character generation
 * The extra feet slot means that the player will need to find twice as much of a single armor piece to gain the same AV and DV as they would without the mutation, because AV and DV are averaged across similar body slots