⚙️ Boss Guide Updated March 20, 2026

The Iron Warden — Boss Guide

The Iron Warden is the fifth boss and the game's ultimate armour test. It has more armour than every other boss in the game — more than the Warden on Mountain Trail, more than anything in Story Mode to this point. Flat damage sources deal a fraction of their normal output. The Iron Warden is defeated with percentage damage: Venom Bow, Bleed Lance, and the patience to let DoT ticks accumulate through its three increasingly aggressive phases. The siege engine events add environmental pressure that the Hollow King and Thorn never introduced.

The Iron Warden

Boss 05 · Map: Frostpeak Tundra / Irongate · Unlocked after Sunken Ruins

Difficulty

3Phases

MaxArmour Level

SiegeMap Hazard

Speed+Phase 3 Move

Contents

Maximum Armour — How It Changes the Fight
Siege Engine Events
Pre-Pull Checklist
Phase-by-Phase Breakdown
Recommended Build
Common Mistakes

Maximum Armour — How It Changes the Fight

The Iron Warden's armour is the highest of any non-final boss in the game. Armour in Tangy TD reduces flat damage received — the fixed-number damage that items like Wand of Lightning and standard Archer arrows deal. At maximum armour, flat damage sources deal significantly less than their stated values. A Wand of Lightning chain hit that would normally deal 200 damage may land for 40–60 at this armour level.

Percentage damage is not reduced by armour. Venom Bow's 5% max HP burst and Bleed Lance's 5% max HP/sec DoT deal their full values regardless of the Iron Warden's armour rating. This fight is a direct test of whether you've completed the flat-to-percentage damage transition that the game has been pushing toward since Endless Mode.

Flat damage reduction by boss — relative comparison

Iron Warden (Boss 05)

Maximum

The Warden (Boss 02)

High

Final Witch (Boss 06)

Medium

Hollow King (Boss 04)

Low

Butcher / Thorn

None

Percentage damage (Venom Bow burst, Bleed Lance DoT) unaffected by armour at all levels.

⚙️ The Iron Warden and The Warden Comparison

Players who struggled with The Warden (Boss 02) because of its armour will find the Iron Warden significantly more demanding — it has meaningfully higher armour and three faster phases. The same solution applies: percentage damage. The difference is that by Boss 05, your Venom Bow and Bleed Lance should be well-invested. If they aren't, the Iron Warden is the fight that forces the correction.

Siege Engine Events

Irongate's map features three elevated siege platforms overlooking the boss arena. During the Iron Warden fight, these platforms periodically fire siege volleys — large AoE impacts that strike random tiles within the arena. Unlike the Bay Harbour Butcher's catapults (which targeted specific towers), siege volleys land on random tiles and deal high damage to any tower on the struck tile.

🏰 Siege Volley Mechanics

Warning window: A targeting reticle appears on the ground for 1.5 seconds before the volley lands. Any tower standing on a reticle tile when the volley hits takes full damage. Move the affected tower off the reticle tile during the warning window.

Frequency: Siege volleys fire approximately every 20 seconds in Phase 1, every 14 seconds in Phase 2, and every 9 seconds in Phase 3.

Cannot be destroyed: Unlike the Butcher's catapults, the siege platforms cannot be targeted or damaged. They continue firing for the entire fight. This is the core environmental pressure that makes the Iron Warden fight distinct — you are managing the boss's attacks AND avoiding random AoE simultaneously.

✓ Siege Volley Response

The 1.5-second warning window is enough time to throw the affected tower off the reticle. When you see a reticle appear under a tower, throw it one tile sideways. The volley lands on the original tile; the tower is safe. The throw does not interrupt attacks — the tower resumes attacking immediately after landing.

Pre-Pull Checklist

Venom Bow on Archer (mandatory) — your primary DPS source. Without it, the fight takes 3–4× as long and the Phase 3 speed escalation overwhelms the Healer's sustain.
Bleed Lance on Defender (mandatory) — the DoT ticks continuously through every siege volley dodge, every Phase 2 attack, and every Phase 3 speed burst. The passive nature is what makes it valuable here.
Iron Fortress on Defender (mandatory) — Phase 3's Iron Crush is a lethal hit without the shield absorbing it. Non-negotiable.
Observe one siege volley cycle before pulling — understand where volleys tend to land relative to your standard positioning before the boss is also attacking you.
Full wave clear, standard pre-pull — same as every boss. Frostpeak Tundra's avalanche event during the wave phase may have repositioned some towers unexpectedly. Confirm all three are in correct positions before the pull.

Phase-by-Phase Breakdown

Phase 1 — Ironclad (100% → 65% HP)

Moderate pace · Siege volleys every 20s · Standard attacks

Phase 1 is manageable. The Iron Warden moves at measured speed, its attacks are telegraphed, and siege volleys are infrequent enough that they rarely coincide with boss attacks. The armour is the primary challenge — watch Bleed Lance ticking and resist the urge to judge progress by visible health bar movement. At maximum armour, Bleed Lance ticks are doing more work than any visual indicator suggests.

Iron Strike

MODERATE

Standard melee with high flat damage. Armour reduces this significantly against the Defender — it's less dangerous than it would be against any other boss at this stage. Healer sustain handles it without stress.

Armour Slam

HIGH

Tell: both arms raised for 1.0s

A two-hit overhead sequence. Higher damage than Iron Strike. The 1.0-second wind-up is readable — Iron Fortress should be active for the second hit if the first one reduces shield absorb. Keep the Healer close throughout Phase 1 to sustain through Armour Slam sequences.

Siege Volley

HIGH (tile strike)

Tell: ground reticle appears 1.5s before impact

Environmental AoE from the platforms. Move any tower on a reticle tile within the 1.5-second window. Phase 1 frequency (every 20s) makes this easy to manage.

Phase 2 — Iron Siege (65% → 30% HP)

Speed increase · Siege every 14s · Armour Aura added

At 65% HP the Iron Warden speeds up and gains Armour Aura — a passive buff that further increases its armour value by approximately 20% above Phase 1 levels. Flat damage sources that were already suppressed become essentially negligible. If your Venom + Bleed setup is in place, Phase 2 is a DPS race managed by repositioning. If your DPS is still flat-damage-reliant, Phase 2 is where the run stalls.

Armour Aura

PASSIVE

The Iron Warden's armour increases by ~20% in Phase 2. This passive activates at the phase transition. If you felt flat damage working in Phase 1, it stops working now. Percentage damage is unaffected.

Iron Charge

HIGH

Tell: lowers body stance before surge, 0.7s

A charge across the arena that deals high damage to any tower in its path. Move non-Defender towers out of the charge vector when the stance appears. The Defender can absorb the charge but the knockback repositions it — expect a brief Healer coverage gap after a charge hit.

Siege Volley (Phase 2)

HIGH

Volleys now fire every 14 seconds instead of 20. Occasionally, a volley coincides with a boss attack requiring simultaneous dodge decisions — boss attack first, then throw the tower off the reticle.

III

Phase 3 — Final Iron (30% → 0% HP)

Maximum speed · Siege every 9s · Iron Crush added

Phase 3 is the most demanding boss phase in the game to this point in the campaign. Maximum movement speed, siege volleys every 9 seconds, and Iron Crush — a lethal unshielded strike — combine into a fight that requires constant active management. The good news: at 30% HP with Bleed Lance ticking at 5% max HP/sec, the boss has 6 ticks of Bleed remaining to death. Phase 3 is short if your percentage damage is in order.

Iron Crush

LETHAL (unshielded)

Tell: slams both fists together overhead for 1.3s

The fight's one-shot mechanic. A massive overhead slam that deals enormous flat damage — but flat damage against maximum armour is still significantly reduced. However, an unshielded Defender hit by Iron Crush can be killed or left at critical HP that Phase 3's ongoing damage overwhelms. The 1.3-second wind-up is generous — if Iron Fortress shield is on cooldown when you see the tell, throw the Defender sideways to delay landing until the shield recharges.

Rapid Siege Volley

HIGH

Every 9 seconds. At Phase 3's pace, a volley may land while the Iron Crush wind-up is in progress — handle Iron Crush first, then address the reticle. An absorbed Iron Crush on a healthy Defender is less dangerous than a landed crush during a reticle dodge.

Speed Surge

MODERATE

The Iron Warden moves at maximum speed in Phase 3, pursuing the Defender directly rather than following a standard patrol or advance path. Keep the Defender at the corridor entrance rather than chasing the boss — let the boss come to the kill zone rather than repositioning toward it.

Recommended Build

Tower	Slot 1	Slot 2	Slot 3	Slot 4
🛡️ Defender	🏰 Iron Fortress Iron Crush survival	🩸 Bleed Lance Primary DPS — ignores armour	🪨 Stone Hammer Controls charge direction	🔨 Ban Hammer Stun amplifies Bleed ticks
🏹 Archer	🐍 Venom Bow Primary DPS — ignores armour	💚 Emerald Bow Pierce accelerates stacks	🌿 Ivy Bow Root stops Iron Charge mid-surge	🥽 Ultra Vision Goggles Range for siege volley safety
✨ Healer	💫 Healing Circle Core regen	🔵 Shield Orb Backup absorption layer	👟 Speed Boots Siege volley repositioning speed	💚 Life Pendant Phase 3 burst heal clutch

Common Mistakes

Using Wand of Lightning as primary DPS

Maximum armour reduces Wand chain hits to fraction values. Players who carried the Wand through the Hollow King (where immunity made it worthless) and kept it for the Iron Warden are now dealing negligible damage from their primary Archer item for the entire fight.

Fix → Venom Bow is mandatory. If Venom Bow hasn't dropped by Boss 05, Cauldron Epics until it appears. Do not attempt this fight with Wand of Lightning as primary DPS.

Letting Iron Crush land on an unshielded Defender

The 1.3-second wind-up is the most readable lethal tell in the game. Players consistently miss it during Phase 3 because they're managing siege volleys simultaneously. Iron Crush + a Phase 3 volley landing simultaneously is the most common run-ending scenario.

Fix → Prioritise Iron Crush response over siege volley dodge. A landed volley on a healthy Defender is survivable. A landed Iron Crush on an unshielded Defender may not be.

Ignoring siege volley reticles during Iron Charge

In Phase 2, Iron Charge and a siege volley occasionally overlap timing. Players focused on the charge forget to check for active reticles. A tower caught by a volley during a charge dodge sequence has both events landing simultaneously.

Fix → During Iron Charge wind-up, glance at the ground for reticles before executing the dodge. One throw handles both: throw the Defender sideways to dodge the charge AND off any reticle simultaneously if they overlap.

Judging DPS progress by visible health bar movement

Maximum armour means even percentage damage looks slow against this boss. Bleed Lance ticking 5% HP/sec with a 20-second Phase 3 means the boss has approximately 6 ticks to death from 30% HP. Players who feel "nothing is happening" and try to swap items mid-fight are creating instability during the most dangerous phase.

Fix → Trust Bleed Lance. At 5% HP/sec, a 30% HP boss at Phase 3 entry takes roughly 6 seconds to die from Bleed alone — plus Venom burst procs on top. The fight is shorter than it feels.

Entering Phase 3 without Iron Fortress cooldown ready

Iron Crush first appears in Phase 3. If the Defender just used Iron Fortress to absorb a large Phase 2 Armour Slam and Phase 3 triggers immediately, the shield may be on cooldown at the exact moment Iron Crush first appears.

Fix → Anticipate the Phase 3 transition at 30% HP. If Iron Fortress was recently used and cooldown is active at 35% HP, don't force DPS — let the Healer sustain through the last 5% of Phase 2 and wait for the shield to refresh before pulling into Phase 3's range.

Next Boss — The Final Witch

Boss 06 is The Final Witch — the campaign finale. It introduces item ability suppression and the Witchcraft tower curse, requires 4-zone simultaneous coverage, and has the longest phase sequence in the game. Completing the Iron Warden unlocks the final map. See the Final Witch Guide.