Talk:Spellbooks/@comment-37.201.4.190-20190525191047/@comment-26393217-20190801155012

You are all right. Heroes can't autocast spells, for the reason that there are no quick slot or something to tell the game what spell he should cast depending on the situation, out of the dozens he may have learned, eventually. This could have been tied to the hot keys, though.

Spellcasting units, on the other hand, do have autocast on any stance (with last unofficial patches). Surely, having up to three spell slots helps the A.I. in that task.