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Steadfasted was a buff on Bakugan Dimensions.
While you are Steadfasted, your opponent can not start Combos against you.
This status is often activated by Defenses and a few Attacks. The main Attribute that uses Steadfasted is Subterra. While Steadfasted, using Attacks as much as you can is wise, so that you can get the most out of the time your opponent is restricted.