Lifesteal items allow you to heal yourself by attacking another player. However, I am finding items are either physical lifesteal or magical lifesteal.
I know gods are classed as either physical or magical, but not sure how this applies to these two types of lifesteal. Maybe there is no connection.
It looks like physical lifesteal applies to auto attacks only, and magical applies to abilities. However, this is only from my observations. I cannot say for certain.