Two levels to pick up the Bladesinging tradition offers some excellent options for melee Rogues, including proficiency in a onehanded melee weapon like the Whip Bladesong grants a nice AC boost (especially for Arcane Tricksters) and some other great benefits, and access to Wizard spells removes the need for the Magic Initiate featEach time you gain a level, you gain 1 additional Hit Die Roll that Hit Die, add your Constitution modifier to the roll, and add the total to your hit point maximum Alternatively, you can use the fixed value shown in your class entry, which is the average result of the die roll (rounded up)There are levels in DnD 5e Is there a level cap in DnD 5e?
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Dnd 5e level up chart