Elites in Slay the Spire 2 are tough and challenging enemies that serve as major difficulty spikes during your climb.
They're positioned as these mini-bosses on your map and are significantly harder than standard hallway monsters but not quite as overwhelming as an Act Boss. They are explicitly designed as a test of your greed and preparation, waiting to severely punish players who haven't drafted a cohesive deck.
Voluntarily routing your path to face these terrors might seem counterintuitive, especially when you encounter Act 1 Elites like the Phrog Parasite. This specific encounter is notorious for clogging your deck with damaging "Infection" status cards before splitting into smaller mini-bosses, like the wriggler.
However, you actively choose to fight them because they act as a mandatory pacing check for your run. If you cannot output enough burst damage to defeat the Phrog before it splits and overwhelms you with minions, your deck simply isn't strong enough to survive the upcoming challenges. There's nothing more annoying than exhausting your resources, thinking you've won, to just realize you've burned out against these wrigglers.
The primary reason you risk your health against Elites comes down to the guaranteed, run-defining loot. Every single Elite you defeat drops a Relic, a permanent, powerful buff that fundamentally strengthens your character's synergies and is essential for completing a run without high stress.
On top of that, Elite encounters offer a much higher chance for rare card drops and produce significantly more gold than regular fights.
Fighting Elites in the early game is a must if you want to accumulate the power necessary to conquer the true challenges waiting higher up the Spire.