What Heavily Armored Does

Heavily Armored is Explosion Resist +100% — the Pal shrugs off explosion damage entirely. No defense number, no other stats: one damage type, fully negated.

That sounds narrow, and it is — but nothing else in the game does it, and explosion-heavy encounters (rocket- and bomb-spamming raid bosses, missile barrages) are exactly the fights where tanks evaporate. Against those it outperforms every general defensive passive; everywhere else, Diamond Body or Idiosyncratic is the better slot.

How to Get It

Heavily Armored is one of the five mutation passives — it never rolls on wild Pals. There are two sources:

• Mutated Eggs. Every Pal hatched from a mutated egg carries one of the five mutation passives at random — see the mutated Pals guide. Community testing shows the passive then inherits through normal breeding like any other.
• The disposable implant. Disposable Implant: Heavily Armored applies it at the Pal Surgery Table (free surgery, implant consumed). It only drops from recycling Glistening Ancient Relics at the Ancient Relic Recycler — a 20% roll in the Glistening-exclusive slot. See the Ancient Relics guide.