I just made a Stone Ruination cloneand forgot to measure the DME. Pitched 3lbs instead of 2, will that increase the ABV?
short answer, yes.
longer answer, it will raise your OG about 8 points (assuming a 5gal batch), and probably raise your ABV somewhere around a half percent, depending on how fermentable the extract is.
Garc_mall is spot on. 3lbs instead of 2lbs isn’t a huge difference but will make it a stronger beer. If you are using dry yeast, recalculate your recipe to identify your intended OG (a sample with hydrometer is better) to ensure you have a yeast cell count that can handle the OG. You should be good if the recalculation/measurement is under 1.060.