Dungeons & Dragons: How To Level Up
You should now look if you gainedany new class featuresfrom the sourcebook of your class. Several featsalso increase one of your ability scoresby one point, so keep that in mind. Fighters gain the ability score/feat option more frequently than other classes. If you raise your Constitution to the point wherethe modifier changes, said changeis retroactive. Most of these benefits areunlocked at level three, while the most advanced featuresare unlocked at level five....