Non dispellable Elemental defense buff
The Devs seem to like all five HotM in a row to have matching Elemental links. So she gets it because she is the Green hero within those five.
Not fond of this set of five non dispellable, Elemental defense buff, Elemental links but it does have the benefit of blocking any Elemental defense debuff ( Panther, Falcon, Evelyn, Frida, Jackal ) since the Elemental defense buff cannot be overwritten.
Kunchen and rumored Ranvir get the most use out of it because Purple and Yellow are weird.
Elemental defense buff
Personally I would chance how Elemental defense buffs work: