Just thought to bring this up because we are dealing with percentages and before Armoury was made, I thought that the math for dealing with the stuff we added onto our shells were something like:

90(100% - [20% + 30% + 10%])

But now it seems like it can be interpreted as the interpretation above or this interpretation:

90(100% - 20%)(100% - 30%)(100% - 10%)

So may I suggest changing this:

Each Arm has a name (which is flavour text), cost and an effect. The cost of an Arm must be spent in Power when it is added to a Pilot’s Arsenal, and may be refunded if an Outfitting Pilot removes the Arm from their Arsenal. An Arm may not be added to an Arsenal if it would cause a Shell’s Power to be reduced to zero or below. Multiple instances of the same Arm do not stack in effect. The following is the list of Arms that has been approved by RAID R&D:

To

Each Arm has a name (which is flavour text), cost and an effect. The cost of an Arm must be spent in Power when it is added to a Pilot’s Arsenal, and may be refunded if an Outfitting Pilot removes the Arm from their Arsenal. An Arm may not be added to an Arsenal if it would cause a Shell’s Power to be reduced to zero or below. Multiple instances of the same Arm do not stack in effect. If a Pilot has multiple Arms on their Shell, then the effects of the Arms are calculated in chronological order and after an effect from an Arm has been applied, then it becomes the new baseline in which the next effect of the next Arm is calculated. The following is the list of Arms that has been approved by RAID R&D: