Traditions

The tradition system is the backbone of your long-term development path in Stellaris. Each tree has 5 traditions plus a bonus for adopting it and a bigger bonus for finishing it — and with 22 trees total but only 7 slots per empire, which ones you pick is a real strategic commitment, not just a formality.

The trees that matter most for opening choices

You won’t have room for all 22, so it’s worth knowing what a handful of the most commonly-prioritized trees actually do:

• Expansion: directly supports early territory grabs — a near-default early pick for most builds.
• Discovery: boosts exploration and research-adjacent bonuses.
• Diplomacy: strengthens external relations and federation-adjacent play — more valuable if you’re leaning into a cooperative or trade-focused build.
• Supremacy: focused specifically on fleets and armies — available to every empire, and the one to prioritize if you’re heading into a war-focused or crisis-prep phase.
• Prosperity: broad empire-wide economic bonuses — a solid generalist pick if you’re not sure what else to take.

This is far from the full list — Adaptability/Versatility, Harmony/Synchronicity, Commerce/Logistics, Domination, Enmity, Fortification, Politics, Subterfuge, Aptitude, Statecraft, Archivism, and Domestication are also real trees, alongside the ascension-specific trees (Cybernetics, Synthetics, Psionics, Biological Ascension, Machine Ascension) tied to your chosen ascension path.

Tradition cost scales as you unlock more

Each new tradition costs more than the last — the formula factors in both how many traditions you’ve already unlocked and your current empire size. In practice, this means tradition point efficiency gets more expensive over time, so front-loading your most valuable picks earlier in the game gets more value per point than spreading them out.

How it connects to Ascension Perks

Completing a full tree unlocks a slot for an Ascension Perk — which means your tree order directly determines how early you unlock key perks, and with only 7 of 22 trees available per game, tree selection and ascension perk planning should really be thought through together rather than one at a time.