Before the battle

1. Prioritize upgrading your Dragon Sword spell as it deals significant damage, especially when Dalygos is in vulnerable mode. 

2.  Similarly, upgrading your Hero's Armor artifact reduces the damage caused by a Mythical Beast like Dalygos the Dragon or the Hydra—until it breaks. Regular upgrades increase the protection you receive when fighting against Mythical Beasts!

During the battle

1. Stay vigilant of Dalygos' Claw or Fire Wrath Attacks. A countdown counter ("Claws in X" or "Fire wrath in X") is displayed below so you know when she'll strike. Use your Wand to cancel the attack and prevent receiving damage from her!

P.S. Keep a wand at ready whenever possible during the battle.

2. Play the Dragon Sword card whenever you can to trigger Dalygos' vulnerable mode. When she's vulnerable, deal as much damage as possible during this crucial time window.