Alignment
As people who follow the rhythm of nature and see themselves as its caretakers, firbolg are typically neutral good. Evil firbolg are rare and are usually the sworn enemies of the rest of thier kind.
Firbolg Magic
You can cast detect magic and disguise self with this trait, using your Wisdom as your spellcasting ability for them. Once you cast either spell, you can't cast it again with this trait until you finish a short or long rest. When you use this version of disguise self, you can seem up to 3 feet shorter than normal, allowing you to more easily blend in with humans and elves.
Hidden Step
As a bonus action, you can magically turn invisible until the start of your next turn or until you attack, make a damage roll, or force somone to make a saving throw. Can only be used once between or short or long rest.
Powerful Build
You count as one size larger when determining your carrying capacity and the wight you can push, drag, or lift.
Speech of Beast and Leaf
You have the ability to communicate in a limited manner with beasts and plants. They can understand the meaning of your words, though you have no special ability to understand them in return. You have advantage on all Charisma checks you make to influence them.
Languages. You can speak, read, and write Common, Elvish, and Giant.