Rage: This can be the reason to play a barbarian. Edge on STR checks and STR saving throws bonus damage, and damage resistance pairs correctly with the playstyle. To my understanding, the only real official source will be the single image in Volo’s (Until there’s another firbolg artwork squirreled absent https://dragonbornmonk13464.blog5.net/69900279/the-elf-fighter-5e-diaries