You either increase one ability score by 2, and increase a different one by 1, or you increase three different ability scores by 1. 

If you were originally a member of a different race you may choose to retain any climbing, swimming, or flying speed, as well as any dark vision or proficiencies you gained from that race. Alternatively, you may gain proficiency in one skill or tool of your choice and 60 ft of dark vision.

Your creature type is either undead or construct (you choose when you take this lineage). You also gain a damage resistance depending on the chosen type (psychic damage for constructs and necrotic damage for undead).

You are either medium or small (you choose when you gain this lineage).

You have escaped death, a fact represented by the following benefits:

• You are immune to poison and disease.
• You have advantage on death saving throws.
• You don’t need to eat, drink, or breathe.
• You don’t need to sleep, and magic can’t put you to sleep. You can finish a long rest in 4 hours if you spend those hours in an inactive, motionless state, during which you retain consciousness

If you were originally a member of a different race you may choose to retain any languages you gained from that race. Alternatively, you can speak, read, and write common and one other language of your choice.