This trophy requires you to unlock pretty much the majority of the map and to complete all 4 of the rituals. You will by default unlock this trophy if you intend to Pack a Punch as the PaP chamber will not open unless all rituals have been completed.
You will also require the
summoning key found in a box in the starting location
The 4 ritual locations can be found in each of the 4 districts.
Nero (The Magician)Requires the Golden Fountain Pen
Found just outside starting area
Jessica (The Burlesque Dancer)Requires Hair Piece
Found high up on ledge in box in Footlight district
Jack (The Cop)Requires Detective Badge
Found in the canals in a sewer grate in Canals district
Floyd (The Boxer)Requires Championship Belt
Found high up on ledge in a box in Waterfront district
Once you obtain the specific item, you are required to bring it to each of the 4 characters locations. Their respective locations will require you to enter beast mode and either smash a door open close to the area you found the item or use the grapple technique and use the electric shock to open doors/lower stairs.
From there you will be required to commence the ritual.
Many fire portals will appear as well as several wraiths that will slowly chase you around. You aren't required to kill any of them, you just need to survive about 30 seconds or so.
Once the ritual has finished, the wraiths will disappear and a Gate Worm will be hovering over the table, take it and move on to the next ritual.
I haven't done this with another person, but in solo you can carry all 4 Gate Worms at once. From what I've seen in other videos online you can only carry 1 Gate Worm at a time if there are two or more people in the game with you.
My strategy is to complete the second ritual containing Juggernog in the area, just look for the glowing perk bottle that is red and go for that ritual second. I usually use a Kuda off the wall, get Jug and i'm pretty much safe to complete all rituals as long as I'm careful.
After the second ritual has been completed as well as the fourth, a Margwa will appear. Simply kill it and move on.
Once you have completed the 4th ritual, the trophy will pop.
Along the way you will also unlock the trophy
From the ShadowsAnd if you complete the second and fourth ritual in one round, open Pack a Punch, or if its round 8 and you manage to kill 2 Margwas within a single round you will also unlock
Margwa Party. BONUS: TO PACK A PUNCH
At any point in this process you must open the Rift. There are 3 entrances, one in each locations near where you perform the rituals and collect the character items. Except Nero, the location at the beginning can only be opened once you have already entered the Rift and used beast mode to power open the door.
Go into the Rift and a wall will have glowing symbols on them, it will disappear once all rituals have been completed. Go to the four podiums, put each of the 4 Gate Worms in the podium and begin a fifth ritual (you should already have the trophy by now).
The last two podiums will require you to wall run. No perk needed, just run at the wall and do a wall run as you normally would via multiplayer.
Avoid the wraiths, have a quick convo with the Shadow Man, and then you can jam a weapon into the glowing blue portal at the back of the room.
Also, a Margwa will spawn when the shadowman disappears after the short conversation.
Here is a video by MrRoflWaffles showing you a guide