Your Constitution score increases by 2, and your Strength score increases by 3.

Your Intelligence score decreases by 1, and your Charisma score decreases by 2.

You have proficiency in Intimidation and Perception. You have half-proficiency in Athletics.

Dul'gin mature at the same rate as firbolgs and live to around the same age.

Dul'gin are about the same size as ogre but the build as humans. Your size is Large.

Your base walking speed is 35 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.

When you reach 3rd level, you can cast the dul'gin fire bolt spell. When you reach 8th level, you can cast the wall of fire spell as a 4th-level spell once with this trait and regain the ability to do so when you finish a short rest. When you reach 15th level, you can cast the karyū no hōkō spell once with this trait and regain the ability to do so when you finish a long rest. Wisdom is your spellcasting ability for these spells.

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

Because of your claws, you have a climbing speed of 25 feet. In addition, your claws are natural weapons, which you can use to make unarmed strikes. If you hit with them, you deal slashing damage equal to 1d8 + your Strength modifier, instead of the bludgeoning damage normal for an unarmed strike.

Sometimes it's hard to use things with giant claws, so the Dul'gin learn how to retract their claws. Their giant armored claws swirl back into their arms, allowing them to have regular hands to pick things up with. This ability can be used as a bonus action to retract the claws and as an action to protract the claws.

Some Dul'gin wish to hide among the other races. Over the years they have developed a way to transform in to a human like form. Things like their hair, teeth, eye color, etc. stay the same. At 1st level the Dul'gin can go in and out of this form as an action and needs to take a long rest to regain the ability. At 8th level the Dul'gin can go in and out of this form as a bonus action and needs to take a short rest to regain the ability. At 16th level the Dul'gin can go in and out of this form freely.

While in this form your walking speed is reduced to 30ft.

Also while you are in this form your Strength score decreases by 1 and your Charisma score increases by 1.