Lord of the Wilds

This KEYSTONE states it makes all Non-minion have 50% less reservation efficiency. This KEYSTONE, however, causes non-minion spirit skills to instead reserve more than 3x the amount of the base spirit cost. A 30 spirit gem will instead require 100 spirit to reserve. Under the Efficiency tooltip it states that something with 50% increased efficiency causes it to reserve 67%, which means it's effectively reducing the cost by 33%. Even if we assume this is doubled when reduced that would mean it'd increase by 66%, meaning a 30 spirit skill would instead cost 49.8, 50 if you round up.

If this isn't a bug, then that means a 50% reduced efficiency is causing a multiplier of 233.33% increase in spirit cost, which makes absolutely no sense.