Byrds are weak enemies found in Act 2 that begin each battle with a flying buff. Until each Byrd is dealt attack damage three times (four times on Ascension 17+) in one turn, it will take half damage from all attacks. This combined with its Strength scaling and multi-hit attacks make the Byrd a fearsome foe for some decks.
Can only use Peck or Caw on the first turn with a 62.5% chance for Peck and 37.5% chance for Caw. Afterwards, has a 50% chance of using Peck, 20% chance of using Swoop, and 30% chance of using Caw. Cannot use Peck three times in a row and cannot use Caw or Swoop twice in a row.
Because Byrds have the Flying buff, they will only take half of the damage dealt until they are hit three(or four on Ascension 17+) times in a turn. Here is the sequence of events when a Byrd loses its Flying buffs:
It will get stunned instantly, interrupting its previous intent;
Because Byrds attack so many times in one turn and have low HP, Thorns is very powerful in this fight.
Attacks that hit multiple enemies multiple times, such as Dagger Spray, are very useful for removing the Byrds' Flying buff.
It is more important to attack a Byrd if it is buffing its Strength; its next turn will be much stronger unless it is knocked down or killed.
Indirect forms of damage, such as from the Defect's orbs or Poison, ignore the Byrds' Flying buff and are therefore more powerful in this fight.
If a Byrd is dealt attack damage more than enough times to knock it down with a single card, the Byrd will be knocked down after the card's effects are finished. Thus, using Whirlwind with 5 Energy will deal half damage to all Byrds 5 times.
The name "Byrd" is just "Bird" spelled with a "y".