Rules Index
GM Core Chapter 2: Building Games Variant Rules Automatic Bonus Progression Special Class Features
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Upgrade Slots

Source GM Core pg. 83
At 4th level, your armor and weapons each gain an additional upgrade slot. This increases at 12th and 19th level, for a total of two additional upgrade slots at 12th level and three additional upgrade slots at 19th level.
<< Devastating Attacks
Defense Potency >>