Multiple Arms

Multiple Arms is a physical mutation that grants the player two extra arms, complete with two extra hands, two extra arm slots, and one extra "Worn on Hands" slot. These extra arms are identical to normal arms in most respects; they can wear items like bracelets and bucklers, hold items and weapons in their hands, wear gloves and gauntlets on their "Worn on Hands" slot, and can be dismembered and regenerated just as normal arms can.

The hands granted by Multiple Arms have a mutation level-based chance to attack with whatever weapon they're holding (or their fists if their hands are empty) every time the player makes an attack in melee. This chance is unaffected by the Dual Wield skill tree, but is affected by Jab; additionally, the extra arms will participate if they player uses the Flurry ability.

The arms and hands granted by Multiple Arms can be distinguished from any other arms and hands the player has by their designation as the player's "lower" arms and hands; for example, "Lower Left Arm", "Lower Right Hand", "Worn on Lower Hands", and so forth. Likewise, players with Multiple Arms will have their original, unmuted arms and hands designated as their "upper" arms and hands; "Upper Left Arm", "Upper Right Hand", "Worn on Upper Hands", and so forth.

Due to the fact that AV and DV values are averaged across all limbs of identical type, having Multiple Arms does not grant the player an advantage in the way of wearing extra glove pieces, as wearing two identical pairs of gloves will still grant the same AV and DV. Indeed, this can work to the player's detriment, as wearing only one pair of gloves will halve the usual AV and DV values granted by them.

Multiple Arms does not specially interact with other mutations which also affect the hands slot. For example, the Flaming Hands mutation will still only affect one pair of hands, and will still prevent the player from taking the Freezing Hands mutation.

Formulas
The following formula is used to determine melee attack chance based on mutation level.

Advantages

 * Allows for the player to make more melee attacks per turn, dealing more damage as a result
 * Can make the early game less painful for dual-wielding builds, as the player can carry a non-floating light source and dual-wield at the same time.
 * Extra hand slots allow for unconventional equipment combinations, such as dual wielding with a shield
 * If Multiple Arms is used only for extra slots to equip relics for their mutations and stat boosts and not to attack, it can be left alone as level 1 to spend the mutation points somewhere else with no significant detriment

Disadvantages

 * High cost at character generation
 * The extra hands and arm slots mean that the player will need to find two of a single armor piece to gain the same AV and DV as they would without the mutation
 * How often the arms attack are not affected by the Dual Wield skill tree, though Jab in the Short Blade skill tree does. To attack often with them, the mutation itself must be leveled