You Charisma and Wisdom scores increase by 1 and your Dexterity score increases by 2

As and undead skeleton, you are immune to the poisoned and exhausted condition.

Fresh water dissolves some essential salt involved in keeping your body together.  You take 20 acid damage if you end your turn in running fresh water.  Exposure to rain or similar weather usually does not have this effect, unless it's really pouring, and neither are you harmed by submersion in an ocean or salt water.

Due to your undead nature, yo suffer from vulnerability to radiance damage.

Abrupt exposure to bright light blinds you for 1 round.

You are an ossified halfling skeleton.  You gain resistance to necrotic, piercing and slashing damage.

Due to your skeletal body and lack of cushioning flesh, you are vulnerable to impacts.  You suffer vulnerability to bludgeoning damage.

Unlike other skeletons, dødelig consist of ossified bone - whenever you are subject to a spell or effect that affects stone, it compromises the magics that keep you alive.  Whenever you are subject to such a spell, you take force damage equal to the spell's level or HD of the creature generating the effect times d6.

A dødelig takes 20 radiant damage when it starts its turn in sunlight.  Your radiance vulnerability does not apply to this damage, though.  While in sunlight, you have disadvantage on attack rolls and ability checks.

Seeing the world through ossified eye-sockets, you have superior vision in dark and dim conditions.  You can see in dim light within 120ft. 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 grey.

As a skeleton, a dødelig doesn't require air, food, drink, or sleep.

You can speak, write and read Common, Halfling, and Undercommon