From Dragalia Lost Wiki
Vulnerable is a special effect that behaves differently on adventurers or enemies.
- On adventurers, Vulnerable will reduce defense by 15% for 90 seconds. This effect can be stacked up to 3 times at once.
- On enemies (in this case Ciella herself), resistance to all afflictions will be reset to their base amounts.
- While this appears as a debuff above adventurers' skills, it CANNOT be cleansed by effects that would normally cleanse debuffs (such as Natalie's Clean SlateLv. 2: Removes all debuffs from the user. If the user's HP is below 30% of max HP when using this skill, increases the user's strength by 20% for 15 seconds.
If the user's HP is above or equal to 30% of max HP, reduces their HP to 20% of max HP and grants them a one-use divergent shield that nullifies damage less than 80% of the user's maximum HP. Divergent shields can stack with ordinary shields. [6000 SP]).