As a descendant of firbolgs, firlings have a carrying capacity +1 size larger than themselves

When emotionally wounded and extremely distressed, firling's mixed lineage cause them to, in less than 1 turn, transform them into a creature 150% their original height, with far more danger associated with interaction. This "False Form" is a defense mechanism to protect the firling from whatever caused them enough distress (ie. a panic attack). The base of their bodies becomes like thorn bushes, thrashing out at anyone within the range of 5 feet, and poisoning those they hit with their thorns. A constitution saving throw above 13 can eliminate the 1d6 poison damage this causes. Their skin becomes like burning bark, cracked and barely concealing embers beneath. This heat causes those within five feet to take 1d6 fire damage, which can be halved by a constitution saving throw above 13.

In essence, the firling becomes a forest fire shaped like themselves. Standing on kindling causes fire all around them, and even the insides of their nostrils and mouth glow from flames within. The only end to this outburst is for the firling to sincerely apologize to those this form has harmed and become calmed down from whatever caused the distress. Once the firling recovers, the fire dies down and the skin turns to an ashy stone-like material. The firling, now free from this form, must crawl out of the bramble left over by the False Form, literally overcoming their harmful defense mechanism in the process. Their clothing and items remain unharmed, proof that the False Form is not even their real body, but a shell designed to protect them from perceived threat.

Touching silver is extremely painful for firlings. Coming into contact with silver causes them 1d6 acid damage, and this is the same when hit with a weapon containing the metal.

yeah knowledge of plants just coms easy to you

deception goes against the code of the firbolg

Your Strength or score increases by 1, and your Charisma score increases by 1, and your Intelligence or Wisdom score increases 2.

Tieflings mature at the same rate as humans but live a few years longer; firbolgs, on the other hand, aren't considered mature until 50, and regularly live up to 600 years. Firlings ages commonly manifest as full maturation at 35 and, commonly, living to ages around 350 or older.

As their lineage values family and unity above society's expectations, firlings have a tendency to become chaotic.

Tieflings are about the same size and build as humans, but firbolgs can grow up to ten feet tall. Your size is Medium, but the average firling is around 8 1/2 feet tall.

Your base walking speed is 30 feet.

Thanks to your infernal heritage, you have superior vision in dark and dim conditions. You can see in dim light within 60 feet of you as if it were bright light, and in darkness as if it were dim light. You can’t discern color in darkness, only shades of gray.

You have resistance to fire damage.

You know the Plant Growth cantrip. You know the spell Disguise Self and can cast it once per short rest. When you reach 3rd level, you can cast the Hellish Rebuke spell as a 2nd-level spell once with this trait and regain the ability to do so when you finish a long rest. When you reach 5th level, you can cast the Flame Blade spell once with this trait and regain the ability to do so when you finish a long rest. Charisma is your spellcasting ability for these spells.

You can speak, read, and write Common, Infernal, and Sylvan.