Stats

Armor, magic resist, mana and attack speed are the same at every star level.

Lissandra

1 star: Hurl a dagger toward the enemy with the highest Attack Damage, dealing 350 to the first target hit. After hitting its initial target or at its final destination, the dagger explodes, dealing 175 to nearby targets. ?
2 star: Hurl a dagger toward the enemy with the highest Attack Damage, dealing 450 to the first target hit. After hitting its initial target or at its final destination, the dagger explodes, dealing 225 to nearby targets. ?
3 star: Hurl a dagger toward the enemy with the highest Attack Damage, dealing 550 to the first target hit. After hitting its initial target or at its final destination, the dagger explodes, dealing 275 to nearby targets. ?

3 patches changed Lissandra, read out of Riot’s game files.

Patch 10.25Dec 2020
- Damage350 / 450 / 600350 / 450 / 5501★ / 2★ / 3★
- Secondary damage175 / 225 / 300175 / 225 / 2751★ / 2★ / 3★
Patch 10.22Oct 2020
- 1000 Daggers rewritten
  Before
  Lissandra hurls a dagger toward her target, which deals 450 magic damage to the first target it hits. After hitting its initial target or at its final destination, the dagger explodes dealing 225 magic damage to nearby targets.
  After
  Lissandra hurls a dagger toward the enemy with the highest Attack Damage, dealing 450 magic damage to the first target it hits. After hitting its initial target or at its final destination, the dagger explodes dealing 225 magic damage to nearby targets.
Patch 10.20Oct 2020
- Damage300 / 400 / 600350 / 450 / 6001★ / 2★ / 3★
- Secondary damage150 / 200 / 300175 / 225 / 3001★ / 2★ / 3★