That’s a good combo I think. The way you do it is cross healing and timing burst.

Build a little tankier so you’re able to heal each other and use mutually supporting skills like orbs, vigor, shards, etc...

Bait the group until a couple of guys peel off from the group. They’ll likely be spec’d either in a specialist role or for soloing. Kite them around, build your ultimate, then hit them at the same time with your ultimates - the colossus’ major vulnerability wrecks people so if you time it right everyone in the area will go down.

That’s the foundation, work together and the potatoes don’t so you win.

All classes synergize together, the players need too as well.

My biggest advice is practice, and say things aloud. At first, focus on movement. In a tower, do you go the same direction up the first set of stairs? If not, work it out it never needs to be said. When movement becomes congruent, then u can more easily evaluate and react.

Magplar has nothing remotely close to a fury stam or necro in regards to burst. They've got a pressure toolkit. Im not saying they can't burst, bc they can. But other classes do it better while you have other tools to be supportive and a killer.

Really a loaded question because there’s not really a simple answer but...

For starters its important that you learn how to play with each other with and without coms. The latter will actually make you even better when you are actually using coms.

Learn the map, all fights don’t take place in a tower. You have to learn to use your environment to your advantage so that means using areas with LOS and even finding choke points; the last thing you want to do is fight in the open.

Play off of each other. That means make sure you’re off healing, moving together unless it’s better to split, making call outs and synchronizing bursts/ults.

Awareness - This and movement is probably the most important factors because it’s what keeps you from dying when you don’t have to. That means keeping track of how many people you’re fighting, what classes you’re fighting, how many healers you’re up against, who to ignore and who to kill , more people coming in to help kill you etc. Also includes knowing who is the biggest threat because contrary to popular belief decent and good players will help kill you.

Movement - Includes making use of los, speed, snare removals, dodge roll vigor/skill cancels, immovables if you need them, managing your stam in order to break free when needed and not being predictable. If you are avoiding hits then you’re avoiding damage. I guess I’ll add setting up ults here because it usually involves movement but it’s also a part of awareness. You do want to split enemies up when possible, although you need to know when to try to burst a group down. Remember those choke points I mentioned? That’s what they are for, stacking a group up and then attempting to kill them. For some odd reason certain people stop healing themselves when they have you outnumbered so be aware of that when using choke points.

Damage and mitigation should be factored as well but I’ll just touch on these because it’s important to know the basics. Without them it doesn’t matter how much damage or mitigation you have, your build will still feel inadequate.

Just run guard on each other...