1,2 or 4
Scarlet has a very useful debuff that can help in a lot of situation. Her tile damage his huge so in a stack, she does very well.
Gormek, a ramming pulverizer is always useful. He doesn’t hit very hard but is sturdy enough to be able to hold his own against 5*. He won’t the one to deliver the killing blow, but he will prepare your other heroes to do so !
If you are at your 3rd 4* team, i assume you can complete all tier of events and rare quests. So, hidden blades will come! The only hero i would wait for, is Wilbur tbh. BUT Atlantis just finished, so it might be a month minimum before you have another chance at him.
If you have a TC20 running, you could keep your mats also, in the hope of pulling a red 5* and then going all in with this one. But there is no guarantee on that scenario
Therefore, depending on the rest of your roster, if you lack a RP, go Gormek, if you want more offense and attack down, go Scarlet