Your Strength score increases by 2, and your Constitution score increases by 1.

Kraul reach adulthood after only a few weeks. Female kraul implant several hundred eggs at a time into the bodies of large insects. When the eggs hatch the larval Kraul consume portions of the host's internal organs before bursting out of the insect's exoskeleton. At this point the larva weave cocoons that they attach to the host's lower carapace. Over the course of several weeks, the larva undergoes a metamorphosis, and emerge from their cocoons as adult Kraul. They then consume what remains of their "mother" leaving only a hallowed out exoskeleton behind. 

Most of the kraul of Ravnica are usually neutral, with a slight inclination towards evil. 

Kraul are between 5 and 6 feet tall and weigh between 130 and 190 pounds. Your size is Medium.

Your base walking speed is 30 feet. 

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 advantage against being charmed or frightened while within 30 feet of at least one other kraul.

Due to your exoskeleton and the shape of your body, you are ill-suited to wearing armor. Your exoskeleton provides ample protection, however; it gives you a base AC of 17 (your Dexterity modifier doesn’t affect this number). You gain no benefit from wearing armor, but if you are using a shield, you can apply the shield’s bonus as normal.

You can climb difficult surfaces, including upside down on ceilings, without needing to make an ability check. You also have a climbing speed of 30 feet.

Kraul, understands Common but has difficulty speaking it. The Kraul language is spoken through a series of humming noises generated by vibrating the kraul's vestigial wings.  Few non-kraul creatures are capable of understanding the language or producing the noises necessary to speak it.   

You have a flying speed of 40 feet. To use this speed you can't be wearing medium or heavy armor.