Iron Twist

Parameters for completing the dungeon Iron Twist
Speed:

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

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

Stages 1-6: 230+ (115 if you bring Decrease Accuracy)
Stages 7-12: 355+ (180 if you bring Decrease Accuracy)
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:

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