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Message: <blockquote data-quote="Charlaquin" data-source="post: 9192218" data-attributes="member: 6779196">No. If you’re a Fighter 3/Wizard 5 (remember, this thread is 5e specific, they’re called Wizards in 5e), you would have 5 hit dice, presumably 3d10s and 2 d6s. If you then gain a level in Wizard, you just gain a Wizard hit die (a d6), because at that point you have 5 total hit dice and 6 > 5. If, on the other hand, you took your new level in Fighter, you could replace one of your wizard hit dice with a fighter hit die.You don’t actually keep track of what hit dice you gained from what class, just how many hit dice you have of what type. Your total number will always be equal to your level in your highest class. When you gain a multiclass, rather than gaining a new hit die, you have the ability to “upgrade” a die to the type the new class uses, if it’s larger. But your total number of dice won’t increase until you gain a level in your highest class, or overtake it in another class.To demonstrate:Level 0: Starting characters get a d8. Total hit dice: 1d8Wizard 1: 1=1, and d6 < d8, so no change.Total hit dice: 1d8Wizard 1/Fighter 1: 1=1, so no new hit die, but d10 > d8 > d6, so you can replace your d8 hit die with a d10. Total hit dice: 1d10Wizard 2/Fighter 1: 2 > 1, so you gain a new hit die. Total hit dice: 1d10 and 1d6Wizard 2/Fighter 2: 2 = 2, so no new hit die, but d10 > d6, so you can replace your d6 with a d10. Total hit dice: 2d10Wizard 3/Fighter 2: 3 > 2, so you gain a new hit die. Total hit dice: 2d10 and 1d6Wizard 4/Fighter 2: 4 > 3, so you gain a new hit die. Total hit dice: 2d10 and 2d6Wizard 4/Fighter 3: 3 = 3, so no new hit die, but d10 < d6, so you can replace one of your d6 hit dice with a d10. Total hit dice: 3d10 and 1d6Wizard 5/Fighter 3: 5 > 4, so you gain a new hit die. Total hit dice: 3d10 and 2d6Now, imagining that you decided to suddenly take a level in Barbarian, you’d have…Wizard 5/Fighter 3/Barbarian 1: 1 < 5, so no new hit die, but d12 > d10 > d6, so you can replace one of your hit dice. Theoretically you could replace a d10 if you wanted to for some reason, but presumably you’d rather replace one of the d6s for maximum benefit. Total hit dice: 1d12, 3d10, and 1d6.Then, maybe you take a level in Sorcerer (you sure do like to diversify!).Wizard 5/Fighter 3/Barbarian 1/Sorcerer 1: 1 < 5, so no new hit die, and d6 = d6 < d12 < d12, so while you technically could replace a hit die… why would you? Total hit dice: still 1d12, 3d10, and 1d6.You don’t actually have to keep track of how much you gained at each bump. Just when you level up and replace a hit die, roll both the old hit die and the new one. If you roll higher on the new one, gain the difference. This will mean that sometimes you gain a lot of HP on replacing a hit die, and sometimes you won’t gain any. In the long run, those instances should balance out though, and moreover, 5e uses hit dice as a healing resource, so even if you get a lucky run of high rolls on the new dice and low rolls on the old several levels in a row, you won’t easily be able to hit that max HP without magical aid.</blockquote>

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