No, you cannot use a 1 action cantrip and an attack action (or, a bonus attack, as all those I’m aware of require you to use the attack action). So, only if the cantrip gives you that ability or is a bonus action cantrip (or, as a Sorcerer, you make it one, with Quicken).
Can you cast a cantrip after an attack?
Yes. If you have a cantrip which you can cast as a bonus action, you may cast it after attacking. Sorcerers can also spend 2 sorcery points to quicken a cantrip so that it may be cast as a bonus action (if they know the Quickened Spell metamagic).
How many attacks do you get with booming blade?
No, You cannot combine attacks with booming blade. Beginning at 5th level, you can Attack twice, instead of once, whenever you take the Attack action on Your Turn. No Attack action is taken, so no extra attacks can be used.
Can you use booming blade as a cantrip?
Booming Blade is not a cantrip for full casters; if you are in melee range you are probably trying to get out of melee range, not do a bit of extra damage. It’s also not a great choice for Arcane Knights at higher levels, since you’ll be forsaking extra attacks in order to do an extra few d8s of damage, maybe.
Can You combo attacks with the booming blade?
Both require concentration, and both require a Bonus Action to cast, of which you only get one per turn. Second, and most importantly to the root of your question, casting Booming Blade does not grant any additional attacks, through either the Extra Attack feature, nor Two-weapon Fighting.
Do you need a spell action to cast booming blade?
Casting Booming Blade requires the Cast a Spell action, not the Attack action. Extra Attack can be used only with the Attack Action.
How does the booming blade work in RuneScape?
Booming Blade. As part of the action used to cast this spell, you must make a melee attack with a weapon against one creature within the spell’s range, otherwise the spell fails. On a hit, the target suffers the attack’s normal effects, and it becomes sheathed in booming energy until the start of your next turn.
