Your proficiency bonus is always based on your total character level, as shown in the Character Advancement table in chapter 1, not your level in a particular class. For example, if you are a fighter 3/rogue 2, you have the proficiency bonus of a 5th- level character, which is +3.
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Prerequisites
To qualify for a new class, you must meet the ability score prerequisites for both your current class and your …
Experience Points
The experience point cost to gain a level is always based on your total character level, as shown in the …
Hit Points and Hit Dice
You gain the hit points from your new class as described for levels after 1st. You gain the 1st-level hit …
Proficiencies
When you gain your first level in a class other than your initial class, you gain only some of new …
Class Features
When you gain a new level in a class, you get its features for that level. You don't, however, receive …