Upper_Krust
Legend
Oh that is a fine idea!
I've used proficiency bonus and constitution modifier in the past but I really like yours too.
Just to clarify its 1/2 Hit Dice, but for Golems increase the amount +5% per point of Material AC above 11. So for an Iron Golem (Iron = AC 19) its:
2014 Iron Golem (20 Hit Dice) = 1/2 HD = 10, increase by 40% = Damage Threshold 14
2024 Iron Golem (24 Hit Dice) = 1/2 HD = 12, increase by 40% = Damage Threshold 16