Artifact Material Raid Stage 13 strategy
I am completely free to play. I have a couple of S tier legendary pulls, but I try to share strategies that are not hero dependent.
In this video I show where to place your fighters and defenders to beat stage 13.
Remember that you need heroes near him to share the damage. You also need strong DPS to take him down fast enough to not get overwhelmed. This means using fighters on him when you can.
You also need to block the minions from getting too close or you will lose. This means defenders who can kill fast enough, or fighters who can kill quickly enough to not let any through.
In stage 13 you also need one unit who can kill and survive on their own in the upper left to stop the slimes from merging.
Watch the video and see how I do it and what units I use.
Good luck!