Shadow Mantle is and always will be best on Susie and therefor Susie's property.
Rude Buster is the best offensive power in the game.
>>712970383
There is zero reason to go for jevils tail over Devilsknife.
With Devilsknife Jevil gets to travel with you just like with Dealmaker Spamton gets to travel with you.
Jeviltail sucks compared to Jevilknife even when it comes to buffing Susie's future OP healing.