Warmaster Horus
Explorer
Multiattack in the MM are usually pretty well spelled out as to what they allow. But it's your game...
I think there's some confusion going on here... I'm not arguing that multiattack should be able to sub any attack for those included within it... only grapple, shove, etc. which are specifcially called out in the PHB as special melee attacks one can substitute for an attack. So no you can't sub a breath weapon for a claw attack... unless the breath weapon says you can... but grapple, shove, etc. specifically do.
I see "Multiattack" as the same as "Grapple" or "Spell". Multiattack isn't just "Attacks: 3 per round"...it is a very specific way of attacking 3 times in a round. Each "attack" isn't something it normally gets. It can't "attack 3 times a round"...so a monster couldn't sub out Claw/Claw/Bite for Dodge/ShootCrossbow/BreathWeapon. Why? Because it doesn't have "3 attacks per round". It has ONE, like everyone else in the game who isn't a high level class with Extra Attacks.
Hiya.
I get that, I just don't think it's the same thing. I see "Multiattack" as the same as "Grapple" or "Spell". Multiattack isn't just "Attacks: 3 per round"...it is a very specific way of attacking 3 times in a round. Each "attack" isn't something it normally gets. It can't "attack 3 times a round"...so a monster couldn't sub out Claw/Claw/Bite for Dodge/ShootCrossbow/BreathWeapon. Why? Because it doesn't have "3 attacks per round". It has ONE, like everyone else in the game who isn't a high level class with Extra Attacks.
It's the same as someone with the Crossbow Expert Feat. That would be listed as "multiattack" on their 'monster sheet';
"Multiattack: The Deft Thug can attack once with it's short sword, and shoot once with it's hand crossbow."
...a DM wouldn't/shouldn't let the Deft Thug 'swap out' his extra shot with the crossbow for a Grapple. Why? Because it's the combo of those 'abilities' that lets him multiattack. He doesn't actually have 2 attacks per turn. This is a very specific 'way of attacking'. Just like a monsters Claw/Claw/Bite Multiattack.
^_^
Paul L. Ming
This interpretation is, to my mind, irrefutable.
Except, as I said before there are a few NPC's who have just a blanket 2 melee attacks, which aren't spelled out. Are you saying these 4 or 5 monster/npc's are able to switch out attacks but none of the others in the book are... if so what do you think the rationale for that is?
A clarification on why I think Mearls' interpretation is TERRIBLE: It creates disgusting and arbitrary disparities between PC and enemy abilities. For example, the PC Extra attack ability carries the restriction that it must be used on the PC's turn...meaning that you cannot as a PC Ready multiple attacks (or at least not without polymorph/wild shape). However, the NPC/Monster ability multiattack carries no such restriction. I don't particularly care to place myself in a situation where I am explaining to my players that the enemy knight is allowed to ready all their attacks but the PC can do no such thing....for arbitrary rule-based reasons.