If you are coming from hundreds of hours of Slay the Spire 1, some of your instincts will carry over — but many will not. Slay the Spire 2 makes fundamental changes to energy economy, enemy design, and card balance that reward new strategies.
Energy is more scarce, cards are more powerful
In STS1, you could often count on an energy relic from the Act 1 boss. In STS2, energy relics are not guaranteed. The game compensates by making cards inherently stronger — zero-cost cards, draw engines, and self-contained value packages are more important.
This means: value every source of energy. Bloodletting, Turbo, and energy potions are premium picks. Also means: do not take high-cost cards unless they win the fight on their own or you have confirmed energy support.
Enemies scale faster and hit harder over time
More STS2 enemies gain strength, apply statuses, or scale over time. This means the old STS1 strategy of building a slow, defensive deck and outlasting everything is less reliable. You need to either kill faster or have a strong block engine.
Statuses are more prominent in STS2 — hand management tools (Flak Cannon, Iteration, Prepared) are more valuable than in STS1. Do not ignore them.
Defect focus is temporary now
This is one of the biggest mechanical changes. In STS1, Focus was permanent once gained. In STS2, Focus is temporary — cards like Hotfix, Focused Strike, and Synchronize provide focus for a limited duration. The community largely approves of this change.
Adaptation: cycle orbs more aggressively. Evoking is not a loss — it is part of the resource loop. Build around orb generation plus temporary focus windows rather than permanent focus scaling.
Relic pool is diluted, elite rewards feel less consistent
The larger relic pool in STS2 means elite fights do not always give run-defining relics. This makes Act 1 more RNG-dependent and puts more weight on card rewards and shop decisions.
Strategy shift: rely less on finding specific relics. Build versatile decks that work with common rewards instead of hoping for a specific relic to make your deck function.
New mechanics to learn
Enchantment system: you can clone cards at campfires with the Clone enchantment. Cloning key cards (Big Bang on Regent, Catalyst on Silent) creates exponential value. This is a new strategic layer STS1 veterans should actively explore.
Act route diversity: Overgrowth vs Underdocks routes change the types of events and enemies you face. Each route rewards different playstyles. Learn to adapt to your route rather than forcing the same strategy every run.