Your Constitution score increases by 2, and one other ability score increases by 1.

Half-trolls raised among trolls tend to be either chaotic or evil. Half trolls raised among humans or other cultures might adopt the predominant alignment of their community. Often shunned by trolls and humans alike, it is not uncommon for half-trolls to exhibit difficulty conforming to those societal norms.

Half-Trolls mature a little faster than humans, reaching adulthood around age 10. Due to their increased metabolism, they age noticeably faster and rarely live longer than 50 years.

Half-trolls are usually larger and taller than humans, and they range from 6 to 8 feet tall. The average weight is between 200 and 400 lbs. Your size is Medium.

Your base walking speed is 30 feet.

Depending on whether you were raised among trolls or humans, chose a language. If you were raised among trolls, pick giant. If you were raised among humans, pick common. If you were raised by another species, pick a language that is relevant.

You gain proficiency in one skill of your choice.

While you are not wearing armor, increase your Armor class by 1. This is in addition to a shield, or any other features or items that may raise your armor class.

At the beginning of your turn you may regain hit points equal to your Constitution modifier. You can use this feature a number of times equal to your proficiency bonus before you must finish a long rest.

You may not use this feature if you have taken acid or fire damage since the end of your last turn, or if your hit points are 0.

You are are made from experiments hybridizing a troll and human. The chosen troll adapted to life in their environment, granting giving them distinct traits compared to other trolls. You have retained some of those traits. Chose one troll heritage when you create this character.

Alpine

You are made from experiments hybridizing an alpine troll and human. Alpine trolls adapted to life in the high elevations of snowy mountains, giving them distinct traits compared to other trolls. You have retained some of those traits as a result of the experimentation process.

You have resistance to cold damage, and you ignore the harmful effects of cold climates up to -10 degrees Fahrenheit. In addition, you have a climbing speed of 30 ft, and you are acclimated to high altitude, including elevations up to 12,000 feet. 

Fell 

You are made from experiments hybridizing a Fell troll and human. Fell trolls are bizarre creatures possessing distinct traits compared to other trolls. You have retained some of those traits as a result of the experimentation process.

You have advantage to wisdom and charisma saving throws to resist spells that cause the charmed condition, and you have dark vision 60 ft. In addition, you have claws that you can use to make an unarmed strike. When you hit with them, the strike deals 1d6 + your Strength modifier slashing damage, instead of the bludgeoning damage of normal unarmed strikes.

Forest

You are made from experiments hybridizing a forest troll and human. Forest trolls adapted to life in the forests or jungles, giving them distinct traits compared to other trolls. You have retained some of those traits as a result of the experimentation process.

You can attempt to hide even when you are only lightly obscurred by foliage and plants, and you can also pass through difficult terrain caused by nonmagical plants without being slowed by them. In addition, you have advantage on perception (wisdom) checks that rely on scent, and you have a climbing speed of 30 ft.

 Lava

You are made from experiments hybridizing a fire troll and human. Fire trolls adapted to life in or around volcanoes, giving them distinct traits compared to other trolls. You have retained some of those traits as a result of the experimentation process.

You have resistance to fire damage, and your Regenerative Healing can be used even if you have taken fire damage since the end of your last turn. In addition, you have a climbing speed of 20 ft.

Marine

You are made from experiments hybridizing a marine troll and human. Marine trolls adapted to life underwater, giving them distinct traits compared to other trolls. You have retained some of those traits as a result of the experimentation process.

You can breath underwater for up to 30 minutes between short or long rests, you have swim speed 30ft, you are resistant to poison damage, and you have dark vision 60 ft.

Swamp Cave

You are made from experiments hybridizing a Swamp Cave troll and human. Swamp Cave trolls adapted to life in the underground swampy caves, giving them distinct traits compared to other trolls. You have retained some of those traits as a result of the experimentation process.

You have darkvision 90 ft, you have a climbing speed of 20 ft. In addition, you have a swimming speed of 20 ft., and you have advantage to saving throws against diseases and their effects.