Constitution Effect

Constitution is a defensive gear effect in Minecraft Dungeons II that raises your maximum health. More hit points means more mistakes survived, more potion windows, and more room for healing effects to work with.
The unique-tier version grants a 30% max-health increase, while the talisman line runs from 20% at Talisman I through 25% at Talisman II up to 35% at Talisman III — the largest health bonus the effect offers anywhere.
Because the increase is percentage-based, Constitution scales with everything else that raises your health pool, and it makes every point of healing more valuable in absolute terms. Healer Effect and Alchemist Effect both convert their output into larger effective gains, and regeneration-style effects refill a bigger bar.
Tank builds and hardcore-minded players who trade some damage for survivability should watch for Constitution rolls, especially on talismans where the Talisman III value is the strongest available. As a gear effect it follows the standard rules: common items never roll it, rare items carry one effect and special items two, and higher threat levels unlock the stronger tiers.