Its the 5E rules, and this is a 5E game - and a pretty arbitrary move if this is what is happening. It's not about what is 'believeable' (it's a fantasy game) - this is such a fundamental core spell, to change it arbitraily (if that is what is happening) is pretty bad, imho. But perhaps those rolls are different for a valid reasons (from a 5e perspective). That was what I was wanting clarity on. D
