"Targeting Felicia" 

Whenever the feathers touched the slime's body, the slime's body part would either turn purple-black or melt under a highly corrosive feather attack. 

Oh. It turned out Cameron's feathers still have these attributes. 

And Sean wasn't useless either. He hurriedly casted every single negative buff he could have through his wings' feathers. 

The feathers touched the slime's body, and countless negative buffs stacked on each other. 

The slow-down buff, burning fire, poison buff, and all sorts of small tricks looked weak but were fatal if used on other ability users...

Even Felicia used her white feathers to create shared feathered armor with the other two boys. 

Her healing spree directly created a mini domain, engulfing the boys in her domain. 

Thus, when the boys accidentally got hit by the corrosive cannon balls, their wounds instantly healed under everyone's naked eyes.