clearstream
(He, Him)
And once again I point to your circular reasoning. You say the outcome cannot be uncertain because you draw a distinction that does not exist for these rules between PC and NPC. Once you've drawn that distinction, the outcome can't be uncertain. I am saying that these rules resist the distinction being made in the first place.It’s right here. I keep quoting it to you.
The DM calls for an ability check when a character or monster attempts an action (other than an attack) that has a chance of failure. When the outcome is uncertain, the dice determine the results.