jtambis6 said:

I've been using Rocktooth with his Rabbie skill (100% Heal Reduction) debuff on the Spirit Guardian and the challenge will not complete. My Rocktooth is Lv 40 4 star with 3 star ascended level and has +200 ACC with 110 speed. Rocktooth attacks first and I place his Rabbie skill on the Spirit Guardian before they can attack. I see the Rabbie skill sticks but I never get the Dungeon challenge complete icon. Please take a look at this bug because I've wasted many energy on this challenge. 

Hi!

We tested and all challange is works correctly. Could you share with us screenshot from challange and from the battle result ?

Thank you

The top picture with Red Arrow shows the Heal Reduction icon on the guardian.

2nd picture is my dungeon challenge still showing incomplete.

Spirit Keep dungeons was either level 4 or 5.