This Destructoid guide ranks the four Seals available in Mortal Shell 2, helping players decide which to equip for the strongest builds. Seals are equippable items with unique abilities, and choosing the right one can significantly affect combat performance depending on a player's chosen class and playstyle.

The Untarnished Seal sits alone in S-tier thanks to its forgiving Perfect Guard ability, which lets players block attacks and deal Break Damage, making it ideal for melee-focused classes. A-tier includes the Infinite Seal, a riskier but higher-reward parry option with a smaller timing window, and the Slayer Seal, which effectively enables an easier mode by restoring health and energy but disables achievements. Vatra's Seal ranks in B-tier, as its ability to fully nullify one attack is undermined by a lengthy cooldown, limiting its usefulness against multiple enemies. The guide notes that overall build effectiveness also depends on pairing Seals with the right Shells and weapons.