I am wanting to make a Bard with some Rogue for the sneak attack. A Bard that uses the mouth harp as an instrument that is also a throwing weapon. I am fairly new to D&D and I don't know where to start. Where should I start?
You might not want to multi-class until you do, at which point it's probably better to wait until level 5 to do it (after you get your ability score increase). If you pick Swords or Valor, you may want to wait until level 7, as they get extra attack at level 6, but it depends how much you expect to need the extra attack (if you're mostly support/casting with some occasional sword play then it's less important).
It also depends what you priority is; you mention sneak attack, but it'll only be a d6 so it's not huge boost unless you intend to take more levels in Rogue (nothing wrong with that). I took Rogue on a Bard but for me the priority was actually the extra expertise (double skill proficiency bonus) as Bard is already good at skill checks, sneak attack was more of a bonus, and good for the flavour (learning thieves' cant), but this was before Tasha's Cauldron of Everything introduced the Skill Expert feat. That said, even at d6 the sneak attack combines nicely with Green Flame Blade and/or Hex if you grab them via a feat or as magical secrets, good for the occasional sword play when required.
Sorry if that's not much in the way of a clear answer; Bard is quite a flexible class in terms of multi-classing as while the higher level features aren't bad, they're not a huge loss if you lock off or delay them, the main consideration is how high you want your spellcasting to go; but if you play your Bard mainly for debuffs, social stealth and support then you don't necessarily need higher level spells.
If you're new, you may want to wait until you have a solid grasp of the game mechanics before you decide to multi-class. There are some solid combinations, but for every one of those there are 100 ways to frick up a character build (by multi-classing). You can never mess up a character by staying in the same class. And it's not just which classes/subclasses you choose, it's when and for how many levels, and what choices you make for each.
Whenever you multi-class you always sacrifice something for whatever you gain.
Two things to start with. The first being what subclasses you want to mix together and why. And the second, Make sure that what you are gaining is worth whatever you are losing, especially in 5th edition DnD. This particular instance, choose your spells carefully and make sure they are worth the d6 you are losing from your sneak attack.
Personally, I like the Swashbuckler rogue and Swords or Whisper bard multiclass. Although the whisper bard's psychic damage (from psychic blades) on a boomeranging lyre is absolutely justified and hilarious to me. Can you imagine being a thug and trying to explain to your boss that you got beaten up with a lyre?
There are a few others that you could try as well. The only one that I can think that might be fun is if you are in a heist type of game and the creation bard with the thief could be fun. I am not sure how well they mesh but I think there may be some untapped creativity there. Perhaps an Eloquence bard with an Inquisitor Rogue as well for a Lie to Me, I dare you, type of character.
Lastly, keep in mind that whatever trick or power spike you are going for, it may not show up until somewhere between levels 6-10, and your fellow players who are on a single class progression may be doing cool things WAY before you will.
Something to always consider when building a spell caster / melee character is distribution of ability scores. You essentially have two "main" stats you need to worry about, and that can spread you pretty thin. If you roll really well then you're gold. The point buy / standard array system is not very generous, but if you only have one stat to try to max out it's easily manageable.
But let's say you want to build a Paladin. Well, you're definitely going to want to hit things and smite, so max out your strength. Then as a melee character you at least want 14 constitution, but THEN charisma is also something that (ideally) would be maxed. You can say, "well my spells aren't as important as my smites" but you are missing out on a lot of good spells, including spell smites that use saving throws. There's also other paladin abilities, including subclass abilities that are really good and depend on charisma.
Now you're talking about a rogue - bard. I would want both dexterity and charisma as high as I can, and a decent con, and not have the rest of my abilities suck. It can all be managed, but you just have to make some tough choices.
Orrrrr..... Hexblade multiclass with either bard or sorcerer. You only have to worry about maxing charisma, then just distribute all the other points as you see fit.
You want to Sneak Attack like a Rogue while playing as a Bard as well? Boy do I have the solution for you. DON'T multiclass Rogue. Take one level of Hexblade Warlock and go Whispers Bard. By level 6 (Bard 5 Warlock 1) you can 'Sneak Attack' 4 times per rest provided you have a +4 CHA mod. Before then you might have to ration your 'Sneak Attacks' more liberally but on the upside you have a very good ranged cantrip and solid Bard spells cast with a good spell DC. And the bonus on top of all this? You can throw in Hex/Hexblade's Curse as well as Booming/Green Flame Blade into the mix as well to result in some very good times (for you not your enemies).
You want to Sneak Attack like a Rogue while playing as a Bard as well? Boy do I have the solution for you. DON'T multiclass Rogue. Take one level of Hexblade Warlock and go Whispers Bard. By level 6 (Bard 5 Warlock 1) you can 'Sneak Attack' 4 times per rest provided you have a +4 CHA mod. Before then you might have to ration your 'Sneak Attacks' more liberally but on the upside you have a very good ranged cantrip and solid Bard spells cast with a good spell DC. And the bonus on top of all this? You can throw in Hex/Hexblade's Curse as well as Booming/Green Flame Blade into the mix as well to result in some very good times (for you not your enemies).
The ranged cantrip doesn’t have nearly the punch with only one level of Warlock. You need agonizing blast.
You want to Sneak Attack like a Rogue while playing as a Bard as well? Boy do I have the solution for you. DON'T multiclass Rogue. Take one level of Hexblade Warlock and go Whispers Bard. By level 6 (Bard 5 Warlock 1) you can 'Sneak Attack' 4 times per rest provided you have a +4 CHA mod. Before then you might have to ration your 'Sneak Attacks' more liberally but on the upside you have a very good ranged cantrip and solid Bard spells cast with a good spell DC. And the bonus on top of all this? You can throw in Hex/Hexblade's Curse as well as Booming/Green Flame Blade into the mix as well to result in some very good times (for you not your enemies).
The ranged cantrip doesn’t have nearly the punch with only one level of Warlock. You need agonizing blast.
You are forgetting that the character is also a full casting Bard with only a 1 level delay in spell casting not to mention the OP wants to do damage similar to a Rogue's Sneak Attack. Since Psychic Blades cap at 15 Bard you could easily get in a extra level or 2 of Warlock in the build or just take the Eldritch Adept feat, but the main point of rushing Bard 5 is so Bardic Inspiration returns on a short rest.
I am wanting to make a Bard with some Rogue for the sneak attack. A Bard that uses the mouth harp as an instrument that is also a throwing weapon. I am fairly new to D&D and I don't know where to start. Where should I start?
Have you chosen a Bard college yet?
You might not want to multi-class until you do, at which point it's probably better to wait until level 5 to do it (after you get your ability score increase). If you pick Swords or Valor, you may want to wait until level 7, as they get extra attack at level 6, but it depends how much you expect to need the extra attack (if you're mostly support/casting with some occasional sword play then it's less important).
It also depends what you priority is; you mention sneak attack, but it'll only be a d6 so it's not huge boost unless you intend to take more levels in Rogue (nothing wrong with that). I took Rogue on a Bard but for me the priority was actually the extra expertise (double skill proficiency bonus) as Bard is already good at skill checks, sneak attack was more of a bonus, and good for the flavour (learning thieves' cant), but this was before Tasha's Cauldron of Everything introduced the Skill Expert feat. That said, even at d6 the sneak attack combines nicely with Green Flame Blade and/or Hex if you grab them via a feat or as magical secrets, good for the occasional sword play when required.
Sorry if that's not much in the way of a clear answer; Bard is quite a flexible class in terms of multi-classing as while the higher level features aren't bad, they're not a huge loss if you lock off or delay them, the main consideration is how high you want your spellcasting to go; but if you play your Bard mainly for debuffs, social stealth and support then you don't necessarily need higher level spells.
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If you're new, you may want to wait until you have a solid grasp of the game mechanics before you decide to multi-class. There are some solid combinations, but for every one of those there are 100 ways to frick up a character build (by multi-classing). You can never mess up a character by staying in the same class. And it's not just which classes/subclasses you choose, it's when and for how many levels, and what choices you make for each.
Whenever you multi-class you always sacrifice something for whatever you gain.
Two things to start with. The first being what subclasses you want to mix together and why. And the second, Make sure that what you are gaining is worth whatever you are losing, especially in 5th edition DnD. This particular instance, choose your spells carefully and make sure they are worth the d6 you are losing from your sneak attack.
Personally, I like the Swashbuckler rogue and Swords or Whisper bard multiclass. Although the whisper bard's psychic damage (from psychic blades) on a boomeranging lyre is absolutely justified and hilarious to me. Can you imagine being a thug and trying to explain to your boss that you got beaten up with a lyre?
There are a few others that you could try as well. The only one that I can think that might be fun is if you are in a heist type of game and the creation bard with the thief could be fun. I am not sure how well they mesh but I think there may be some untapped creativity there. Perhaps an Eloquence bard with an Inquisitor Rogue as well for a Lie to Me, I dare you, type of character.
Lastly, keep in mind that whatever trick or power spike you are going for, it may not show up until somewhere between levels 6-10, and your fellow players who are on a single class progression may be doing cool things WAY before you will.
Something to always consider when building a spell caster / melee character is distribution of ability scores. You essentially have two "main" stats you need to worry about, and that can spread you pretty thin. If you roll really well then you're gold. The point buy / standard array system is not very generous, but if you only have one stat to try to max out it's easily manageable.
But let's say you want to build a Paladin. Well, you're definitely going to want to hit things and smite, so max out your strength. Then as a melee character you at least want 14 constitution, but THEN charisma is also something that (ideally) would be maxed. You can say, "well my spells aren't as important as my smites" but you are missing out on a lot of good spells, including spell smites that use saving throws. There's also other paladin abilities, including subclass abilities that are really good and depend on charisma.
Now you're talking about a rogue - bard. I would want both dexterity and charisma as high as I can, and a decent con, and not have the rest of my abilities suck. It can all be managed, but you just have to make some tough choices.
Orrrrr..... Hexblade multiclass with either bard or sorcerer. You only have to worry about maxing charisma, then just distribute all the other points as you see fit.
You want to Sneak Attack like a Rogue while playing as a Bard as well? Boy do I have the solution for you. DON'T multiclass Rogue. Take one level of Hexblade Warlock and go Whispers Bard. By level 6 (Bard 5 Warlock 1) you can 'Sneak Attack' 4 times per rest provided you have a +4 CHA mod. Before then you might have to ration your 'Sneak Attacks' more liberally but on the upside you have a very good ranged cantrip and solid Bard spells cast with a good spell DC. And the bonus on top of all this? You can throw in Hex/Hexblade's Curse as well as Booming/Green Flame Blade into the mix as well to result in some very good times (for you not your enemies).
The ranged cantrip doesn’t have nearly the punch with only one level of Warlock. You need agonizing blast.
You are forgetting that the character is also a full casting Bard with only a 1 level delay in spell casting not to mention the OP wants to do damage similar to a Rogue's Sneak Attack. Since Psychic Blades cap at 15 Bard you could easily get in a extra level or 2 of Warlock in the build or just take the Eldritch Adept feat, but the main point of rushing Bard 5 is so Bardic Inspiration returns on a short rest.
Nah. 1st level feat (V Human or Custom origin) take Eldritch Adept and then swap to Agonizing Blast when you dip Warlock. Done and Done.