If you gain the Extra Attack class feature from more than one class, the features don't add together. You can't make more than two attacks with this feature unless it says you do (as the fighter's version of Extra Attack does). Similarly, the warlock's eldritch invocation Thirsting Blade doesn't give you additional attacks if you also have Extra Attack.
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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 …
Hit Points and Hit Dice
Your proficiency bonus is always based on your total character level, as shown in the Character Advancement table in chapter …
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 …