The Iron Twins in Raid Shadow Legends is a single boss encounter found in the Iron Twins Fortress. The fortress is a daily reset dungeon that changes affinity each day. You’ll face a challenging encounter that will ramp up in difficulty if you are not swift to defeat the metal monstrosity. Having a good strategy is therefore crucial so let’s break down the boss mechanics.

Voltaic Pendulums
Attacks 1 enemy. Places a 30% [Decrease C. RATE] debuff for 4 turns. Also places a 25% [Weaken] debuff for 4 turns if the target is already under a [Decrease C. RATE] debuff. After attacking the initial target, attacks all other enemies. Places a 50% [Decrease ATK] debuff for 4 turns. Also places a 60% [Decrease DEF] debuff for 4 turns on enemies under [Decrease ATK] debuffs. Will ignore [Unkillable] buffs whenever the Iron Twins’ HP is equal to or less than 40%.

Fires of Insanity – 3 Turn Cooldown
Attacks all enemies. Places or extends [Ironbrand] debuffs on all enemies. The duration of each [Ironbrand] debuff given depends on each enemy’s DEF. The enemy with the highest DEF will receive 10 turns of [Ironbrand]. The enemy with the next highest DEF will receive 9 turns of [Ironbrand], while the enemy with the next highest DEF will receive 8 turns of [Ironbrand], and so on. If an enemy already has a [Ironbrand] debuff, the duration of their current [Ironbrand] debuff will be extended by this number of turns.
[Ironbrand] debuffs cannot be blocked or removed.
[Growth Effect] Every time this skill is used, the Iron Twins’ DEF will be increased by 2.5%, plus an additional 1% for every enemy whose Affinity does not match the Iron Twins’.
The Iron Twins will not use this skill when their HP is below 40%.

Ruinous Swath
Attacks all enemies. Places or extends [Ironbrand] debuffs on all enemies. The duration of each [Ironbrand] debuff given depends on each enemy’s ATK. The enemy with the highest ATK will receive 10 turns of [Ironbrand]. The enemy with the next highest ATK will receive 9 turns of [Ironbrand], while the enemy with the next highest ATK will receive 8 turns of [Ironbrand], and so on. If an enemy already has a [Ironbrand] debuff, the duration of their current [Ironbrand] debuff will be extended by this number of turns.
[Ironbrand] debuffs cannot be blocked or removed.
[Growth Effect] Every time this skill is used, the Iron Twins’ ATK will be increased by 2.5%, plus an additional 1% for every enemy whose Affinity does not match the Iron Twins’.
The Iron Twins will not use this skill when their HP is below 40%.

Doomsday Machine [Passive]
Attacks all enemies 2 times. Each hit places or extends a [Ironbrand] debuff. The first hit places a [Ironbrand] debuff whose duration depends on each enemy’s DEF. The enemy with the highest DEF will receive 5 turns of [Ironbrand]. The enemy with the next highest DEF will receive 4 turns of [Ironbrand], while the enemy with the next highest DEF will receive 3 turns of [Ironbrand], and so on. If an enemy already has a [Ironbrand] debuff, the duration of their current [Ironbrand] debuff will be extended by this number of turns.
The second hit does the same, but the duration of the [Ironbrand] debuffs placed depends on each enemy’s ATK instead. After the first two hits, attacks all enemies again. The damage inflicted to each enemy increases according to the number of turns remaining on each enemy’s [Ironbrand] debuffs. This hit will ignore 30% of each target’s DEF.
[Growth Effect] Every time this skill is used, the Iron Twins’ ATK and DEF will be increased by 4%, plus an additional 1% for every enemy whose Affinity does not match the Iron Twins’.
The Iron Twins will only use this skill when their HP is below 40%.

Retaliatory Launch [Passive]
Whenever the Iron Twins’ HP drops below 85%, 70%, 55%, and 40%, instantly attacks all enemies, then removes all debuffs from the Iron Twins.
Fills the Iron Twins’ Turn Meter by 10% whenever an enemy receives a buff. Will not fill their Turn Meter if the Iron Twins are under [Decrease SPD] debuffs.
The Iron Twins receive 50% less damage from each subsequent hit from multi-hit skills. The damage reduction increases with every additional hit. The Iron Twins are immune to Turn Meter reduction effects.

Almighty Immunity [Passive]
Immune to [Stun], [Freeze], [Sleep], [Provoke], [Block Cooldown Skills], [Fear] and [True Fear] debuffs. Also immune to HP exchange effects, HP balancing effects, and cooldown increasing effects.

Almighty Strength [Passive]
Damage from skills that scale based on enemy MAX HP cannot exceed 10% of the boss’ MAX HP when attacking the boss. Poison Effects are 90% less effective.

As you can imagine the Iron Twins as a combination of the Celestial Griffin‘s mechanic where he gets stronger as the fight goes on and the Ice Golem boss who can retaliate with major damage if he passes certain threshold. This basically means you cant take forever to kill the boss, nor can you burst it aggressively. The boss has a cap of 10% for any incoming enemy max hp damage so you’ll not be able to 1 shot it!

The good news is that the Ironbrand debuff can be resisted although the boss stats are quite high so we will need to bring a Decrease Accuracy Debuff. You’ll also want to bring a Decrease Speed debuff otherwise the Twins will gain 10% Turn Meter for every buff you place. Remember: we do not want the boss to be taking many turns or his damage will ramp up. Dealing damage will need to be balanced between:

1. HP Burn = It is capped at 50k but likely a good source of damage
2. Poisons = Whilst it is reduced by 90% it is still good stable damage output and may bypass the boss passive
3. Enemy Max HP = timed well this can help speed up the fight but be careful about causing the passive HP thresholds to drop loads of damage on you. The boss will also clear all debuffs so you could lose your essential debuffs like Decrease Accuracy.

You will also want to bring core debuffs such as Decrease Attack, Decrease Defence and Weaken although the latter 2 are less important the more you rely on HP Burns and Poisons.

The final point to take into consideration is Affinity. The boss starts with considerable base stats (around 26k Atk/Def at Stage 15) so you do not want to allow this to be grown too far through the growth effects on the boss skills. For every mismatched affinity you increase the boss damage quite considerably. Try to build a team of matching affinity.

Main things to Avoid:

1. Multi-hitters like Cruetraxa – The boss will reduce the damage quite significantly.
2. Low Resist or Low defence teams – Glass Cannon is not the way to go
3. Loads of Enemy Max HP Nukers – You don’t want the Boss to hit you each time on the passive.
4. Mismatched Affinity to the Boss – This will increase the damage output and potentially lead to your team failing.

Beating the Iron Twins can be done in a few ways and we have examples of team compositions below! First let’s cover the minimum stats you should aim to hit.

For a full stat breakdown, use our handy Raid Stages Tool which displays enemy stats for every encounter in the game. If you are not already a member of the HellHades community, you can sign up for a Free Account to gain access to this tool. Below we will outline the minimum stats you should aim for:

The key stats you should consider are Accuracy, Resistance and Speed on your team alongside good HP/Def to survive the damage.

Iron Twins Stages

There are 15 stages to complete and you ideally want to be farming the highest stage you can farm. To be successful, aim for:

Speed:

1. Stages 1-6: 150+ Speed to go before the Iron Twins
2. Stages 7-12: 220+ Speed to go before the Iron Twins
3. Stages 13-15: 250+ Speed to go before the Iron Twins

Accuracy:

1. Stages 1-6: 155+ (104 if you bring Increase Accuracy)
2. Stages 7-12:  280+ (187 if you bring Increase Accuracy)
3. Stages 13-15: 555+ (370 if you bring Increase Accuracy)

Resistance: 

1. Stages 1-6: 230+ (115 if you bring Decrease Accuracy)
2. Stages 7-12: 355+ (180 if you bring Decrease Accuracy)
3. Stages 13-15: 705+ (350 if you bring Decrease Accuracy)

Depending on which strategy you choose, you should ensure you have enough HP and Defence to survive this encounter. Generally we advise at least:

1. Stages 1-6: 25k HP and 2400 Defence
2. Stages 7-12: 40k HP and 2800 Defence
3. Stages 13-15: 50k HP and 3500 Defence