You need to account for the base damage before the set bonus increases it to get an accurate depiction of things. For instance, LoN used to give 100% increase per ancient but now gives 750% increase to your base 100% damage. If you have 13 ancients then it is 100%+(750%*13) = 9850% vs the old 100%+(100%*13) = 1400% which translates to an overall damage change of 9850%/1400% ~= 7.04 times damage. If you only have one ancient equipped then it is a much smaller change because 100%+(1*750%) = 850% vs the old 100%+(1*100%) = 200% is only 850%/200% = 4.25 times damage but any reasonable number of ancients (10+) gets close to the 7x multiplier vs the old bonus.
For most bonus increases there is little difference since they are already huge numbers but it can make a significant difference for smaller bonuses.
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You need to account for the base damage before the set bonus increases it to get an accurate depiction of things. For instance, LoN used to give 100% increase per ancient but now gives 750% increase to your base 100% damage. If you have 13 ancients then it is 100%+(750%*13) = 9850% vs the old 100%+(100%*13) = 1400% which translates to an overall damage change of 9850%/1400% ~= 7.04 times damage. If you only have one ancient equipped then it is a much smaller change because 100%+(1*750%) = 850% vs the old 100%+(1*100%) = 200% is only 850%/200% = 4.25 times damage but any reasonable number of ancients (10+) gets close to the 7x multiplier vs the old bonus.
For most bonus increases there is little difference since they are already huge numbers but it can make a significant difference for smaller bonuses.