Warmaster Horus
Explorer
Unless there has been an official ruling on the subject, I disagree with this. There is no blanket rule saying you can't cast more than one spell in the same turn. The only rule is that if you cast a spell as a bonus action, you can't cast another non-cantrip spell on the same turn. Action Surge is not a bonus action, so I would argue you can cast two spells with it.
From the v0.2 Basic DND Rules
Bonus Action
A spell cast with a bonus action is especially swift. You
must use a bonus action on your turn to cast the spell,
provided that you haven’t already taken a bonus action
this turn. You can’t cast another spell during the same
turn, except for a cantrip with a casting time of 1 action.
Although it's covering Bonus Action casting, the rule does say only Cantrips with 1 action casting can be cast if another spell is cast in the same turn. Haste also specifically excludes Casting from the list of allowable things to do with its' extra action. My take is that it's one non-cantrip spell a turn.
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