[RPG] If you cast a higher-level spell from a spell scroll with a casting time of 1 action, but fail the check, can you cast a bonus-action spell that turn

actionsdnd-5emagic-itemsspellcasting

The bonus-action spellcasting rule states (PHB p. 202):

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.

The description of a spell scroll states (DMG p. 200):

If the spell is on your class's spell list but of a higher level than you can normally cast, you must make an ability check using your spellcasting ability to determine whether you cast it successfully. The DC equals 10 + spell's level. On a failed check, the spell disappears from the scroll with no other effect.

If you fail the check to cast the higher-level spell via the scroll, does the spell count as being cast despite there being no effect?

This question is very similar to this one – If a spell cast from a Spell Scroll is Counterspelled, is the scroll consumed? – but I am not sure if the answers in that question apply to this situation as well.

Best Answer

You cannot cast another spell as a bonus action.

The description for spell scrolls says

Casting the spell by reading the scroll requires [...]

This means you're still casting the spell, so it counts for the casting limitations in the bonus action spells. Now for the case where the spell fails:

If the spell is on your class’s spell list but of a higher level than you can normally cast, you must make an ability check using your Spellcasting Ability to determine whether you cast it successfully. The DC equals 10 + the spell’s level. On a failed check, the spell disappears from the scroll with no other effect.

This text suggests that even if you fail the test you're still casting the spell, with the only effect being that it disappears from the scroll (which also suggests the spell was used).

If the spell was cast and you can only cast a spell of lvl 1+ once per turn, I conclude that you cannot cast another bonus action spell after it.