In diamond form you can intercept easily. Her sp 1 and 2 add power sting to the defender, and while the sp1 does decent damage, the sp2 is the way to go.
She stays in diamond form as long as the defender has more power than her. When you have more power than the defender, you go to telepath form.
In telepath form, she's good against evade champs because they cannot evade, and she hits harder. You can force this form by launching heavies, because they cause power gain for you more than for the defender.
Emma is a beast, for highest dps spam heavys until she changes forms and then keep attacking until she has ten prowess and then unload sp2 but she’s immune to everything in diamond form and ignores evade in telepath form. I have her at r4 as a five star and am considering her for r5 she’s so useful. And honestly there isn’t a whole lot of gameplay out there on her but KT1 has a good video highlighting all the cool stuff she can do. Heres the link https://m.youtube.com/watch?v=5NzSBNC70tg
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She stays in diamond form as long as the defender has more power than her. When you have more power than the defender, you go to telepath form.
In telepath form, she's good against evade champs because they cannot evade, and she hits harder. You can force this form by launching heavies, because they cause power gain for you more than for the defender.