Can you use a cantrip as a reaction?
You can cast a bonus action cantrip and all of those full leveled action spells (1 as a reaction before your turn, 1 on your turn, 1 as an Action Surge, 1 as a reaction after your turn all in the same round.)
Does magic missile work with war caster?
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. Does Warcaster work with Eldritch Blast? According to this sage advice Warcaster can use Eldritch Blast as long as all attacks go against the provoking creature.
Can you split up Eldritch Blast?
The spell creates more than one beam when you reach higher levels: two beams at 5th level, three beams at 11th level, and four beams at 17th level. You can direct the beams at the same target or at different ones. Make a separate attack roll for each beam." Can resilient be taken multiple times? What about Resilient? The Resilient feat can be taken only once.
Is it better to have advantage or proficiency?
If you just look at making your saving throw to maintain concentration, Advantage will win over Proficiency in the lower levels, and will slowly be outclassed in the later levels. This lets you choose your own winner, depending on the type of game you're playing. Do Paladins need resilient con? Resilient Con is usually not necessary for paladins unless they've got an abnormally low charisma (in which case, boost your charisma). Infernal Constitution grants resistance to two relatively common damage types- it's not usually the first thing I take for a tiefling character but it's one that's never not useful.
Does spell sniper work with booming blade?
The new wording does not lean on the range of the spell, but explicitly states that the target must be within 5 feet. Green-Flame Blade no longer works with Spell Sniper. Booming Blade no longer works with Spell Sniper. Can you use booming blade with shadow blade? This change has nothing to do with prohibiting or allowing Shadow Blade to combine with Booming/Green-Flame Blade. It's about fixing those two cantrips.
Can a warlock use a shield?
Warlocks only get proficiency in light armor, so if you want to use a shield (either an armored book or normal shield) without penalty then you would need to take levels in a class that grants shield proficiency or take the Moderately Armored feat.