The Bulwark

Iron Skin is base armour times a stack of multipliers, and Strength enters twice (via Ironclad Charge's bonus and as a final multiplier).

Health Conversion at three stacks gives 1350 armour, far more than Umbral Fiber's 378 on Rhino's tiny 290 base.

Reinforcing Stomp restores 4% of the total per enemy hit, so you never redo the full combo.

Arcane Battery converts the armour into up to 1000 energy.

1.

Get kills for energy and health orbs; build Health Conversion to three stacks.

2.

Group a crowd (Proboscis Cernos, Magus Anomaly, Vazarin Snare).

3.

Cast Charge through the group for the Ironclad Charge bonus.

4.

Stomp constantly for crowd control and to keep Iron Skin near max.

5.

Keep Roar up.

Primed Continuity gives Ironclad Charge a 15s+ setup window and near-minute Roar.

Efficiency at 45% because Arcane Battery plus Equilibrium covers it.

A little Range gives a 30m+ Stomp and Roar.

Strength is the whole build.

Blind Rage, Umbral Intensify are the Strength, with Primed Continuity holding Duration.

Ironclad Charge is the mandatory armour multiplier.

Health Conversion is a large stacking armour source.

Reinforcing Stomp is the top-up.

Equilibrium converts orbs.

Blind Rage to Transient Fortitude if energy is tight in quick missions.

The aura and exilus are open.

Pick one.

Subsume over Stomp (unless you keep it, in which case run Nourish over Charge).

- Parasitic Armor for the biggest armour boost (see The Immovable).

- Elemental Ward (Cold) for ~1291 armour plus reflection.

- Ensnare, Larva or Airburst for grouping to feed Ironclad Charge.

- Empower to boost both Iron Skin and Roar.

Arcane Battery for the energy pool, Molt Augmented for Strength.

Arcane Guardian now builds Iron Skin on hits taken, a strong swap.

Madurai for a 40% Strength Sling perk.

Vazarin for a grouping ability.

None from the frame beyond Roar.

A grouping weapon (Proboscis Cernos) helps the Charge setup.

Iron Skin, topped by Reinforcing Stomp.

No regen otherwise; when the pool is gone you redo the combo.

Toxin bypasses it.

Arcane Battery plus Equilibrium.

Once Iron Skin is huge you only cast Roar and Stomp.

Toxin.

Deep endurance where a hit exceeds the pool.

The setup ritual.

Does no damage itself.

The Immovable Parasitic Armor build pushes Iron Skin into the millions.

A Roar buff build.

An endurance Nourish non-tank build.

Strong: near-unkillable in most content, strong team Roar, simple, no helminth needed.

Weak: zero self damage, toxin-vulnerable, setup ritual, no regen, 6 forma.

Players who want a no-subsume Iron Skin tank that carries a weapon and a Roar.