It is consistent to say that magic missile is not usable by twinned spell, but is usable with warcaster (provided that the spell only targets one creature), if my premises are to be believed.
Can a cantrip be used as an attack of opportunity?
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 Eldritch Blast with war caster?
The 3rd benefit of War Caster requires you to target only the moving creature. Eldritch blast works as long as all the beams target it.
Can you use war caster to cast a cantrip?
Warcaster doesn’t state that it changes casting time of the spell when you replace an OA with it like Quicken spell does. Could you use WC to reaction cast an action cantrip on the same turn you cast a bonus action spell? Yes.
Can you split up Eldritch Blast?
Eldritch blast absolutely is multiple attacks. Every time you make an attack roll, that’s an attack. There is nothing in the rules that supports any of these claims.
When can you make an opportunity attack?
You can make an opportunity Attack when a Hostile creature that you can see moves out of your reach. To make the opportunity Attack, you use your Reaction to make one melee Attack against the provoking creature. The Attack occurs right before the creature leaves your reach.
Can you cast Eldritch Blast as a reaction?
Can you Eldritch Blast as a Readied action even though it’s multiple attacks? The PHB states: You can direct the beams at the same target or at different ones.
Can you cast more than one cantrip per turn?
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.
Does Warcaster use a spell slot?
Nothing is mentioned regarding slots’ usage when casting a spell as a reaction throughout the 5e War Caster feat. However, they are considered level 0 that don’t expend spell slots.
