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

Your character can speak, read, and write Common and one other language that you and your DM agree is appropriate for the character. The Player’s Handbook offers a list of widespread languages to choose from. The DM is free to add or remove languages from that list for a particular campaign.

You are humanoid.

You are Large.

whenever you exceed the carrying capacity of a medium creature your speed is cut in half.

Your walking speed is 40 feet.

You have a climbing speed equal to your walking speed.

You have antennae you use to sense your surroundings. You are able to perfectly sense everything surrounding you in a range of 10ft.

Your sight is limited to 60ft.

You can use your mandibles to perform an unarmed Sting attack using your Strength or Dexterity. On a hit, you deal 1d4 + Dex/Str piercing + 1d6 poison damage.

Your centipede half features a sturdy shell on it's segments, giving you a unarmored AC equal to 12 plus your dexterity modifier.
However, as the shells are dry, you have a weakness to fire.