Byrdonis Egg•Quest

Is Byrdonis Egg good in Slay the Spire 2?

Byrdonis Egg is a quest Quest quest in Slay the Spire 2. In combat it resolves as: Can be hatched at a Rest Site. It currently underperforms most alternatives, sitting at D tier in our Slay the Spire 2 card rankings.

Across 6 recorded runs, decks running it win 0.0% of the time, trailing the 12.6% average by 12.6%. It’s a more selective pick, turning up in just 1.2% of decks that could run it. Necrobinder players keep it in 1.2% of their runs, so it’s a familiar sight in those decks. On average it shows up 1.0 times in the decks that take it.

It performs best next to Ascender's Bane — together they post a 0.0% swing in win rate. At - energy, it’s upgraded in 0.0% of runs and usually joins the deck around floor 6.

That’s 0 wins, 5 deaths, and 1 abandoned runs with it in the deck. The encounter that most often ends a run carrying it is Phrog Parasite Elite, which closes out 66.7% of its appearances. Read on for Byrdonis Egg’s complete synergy, class, and threat breakdown to decide whether it earns a slot in your Quest run.

Best Cards to Pair with Byrdonis Egg

Ranked by win-rate lift, Byrdonis Egg performs best alongside Ascender's Bane (0.0%).

Ascender's Bane0.0%3 runs

Based on small co-occurring samples — treat these as early signals, not final verdicts.

Byrdonis Egg Win Rate by Class

Byrdonis Egg is played across 4 classes, led by Necrobinder (0.0%), Regent (0.0%), and Ironclad (0.0%) by win rate.

The Necrobinder0.0%2 runsThe Regent0.0%2 runsThe Ironclad0.0%1 runsThe Defect0.0%1 runs

Byrdonis Egg Card Details

Byrdonis Egg is a quest quest costing - energy; it’s upgraded in 0.0% of runs and usually picked up by floor 6.

Can be hatched at a Rest Site.

What Ends Runs with Byrdonis Egg

Byrdonis Egg’s most common run-enders are Phrog Parasite Elite (66.7%).

• Phrog Parasite Elite66.7% of runs

See Also

Compare Byrdonis Egg with the rest of the best Slay the Spire 2 cards, relics, and classes below.