Get to summon beastly allies equal for their Constitution modifier at some point – which could toss up some exciting possibilities for the Warforged. There is not any overlap between the Firbolg’s traits and also the Barbarian’s capabilities. Their innate spellcasting is mostly useless for the Barbarian (Hidden Step works, https://tabaxi-rogue82792.wizzardsblog.com/28072117/a-review-of-high-elf-wizard-5e