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Bestiary / Monster Advancement / Adding Racial Hit Dice

Step 3: Ability Scores

Source Pathfinder RPG Bestiary pg. 296
Once you have determined the number of additional Hit Dice possessed by the creature, use this number to modify its other statistics. Start with ability scores. For every 4 additional Hit Dice gained by the monster, add 1 to one of its ability scores. In addition, make any modifications to its ability scores based on an increase in size, as noted on Table 2–2.

Archives of Nethys

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Step 3: Ability Scores