If you want to see how to make the main costume, you can follow this link http://www.instructables.com/id/Marvels-Avengers-Loki-Costume/
Step 1: Tools and materials
Rotary Dremel Kit
Detail Sander (you can use general sand paper, this just makes things a lot faster)
Craft/box cutting knife
Basic Sculpting tools
Hot Glue Gun
Liquid latex or casting silicon
Clear Casting resin
Blue Food coloring or dye
Plaster Of Paris or casting plaster
Step 2: Making your stencil.
For this step, I took a simple image that you can find on the net, Placed it into a drawing program, and added a box grid. Once you have a grid, you are able to free hand draw this onto a piece of cardboard to use later.
Step 3: Making your stencil 3D
The scepter template was covered on both sides with "builders expanding foam", from there, a hacksaw blade was used to cut away the excess foam around the edge of the template.
From there you simply need to sand, and shape your foam to the shape you want your finished product to be.
Step 4: Making your blades.
How you produce this is completely up to you, for myself it was a mixture of using a rotary dremel, a miniature hand saw, and contact adhesive to build up multiple layers.
Step 5: Boging the body
Usually for every golfball sized bit of bog you use, you would squeeze a 25mm line of hardner from the tube to mix with the bog.
What you are going to do here is basically cover your entire foam sculpt of your staff in bog, a really easy way of doing this is to wear latex gloves and use your hands, If you dont have gloves, then usually covering your hands in canola oil will do the trick to stop it sticking.
Make sure that you give your model atleast a 3mm thick coat all the way around 'minimal', Ideally if you can make it 4 or 5mm then you will have a stronger finished product after sanding. The cleaner you can put this bog on, the easier detailing will become.
Note, in my picture I did the bog on foam in 2 separate halves, wouldn't recommend that way.
Step 6: Making the staff
I simply took a reasonable bit of wood, Cut a slight fat ended ' S ' shape into it with my oscillating multitool.
From there I filleted the edges to give it some curb, And then just sanded it down to give it that rounded smooth shape.
The base of the staff has to be a bit fat to make the staff look balanced, I did this simply buy gluing layers of EVA foam (camping foam mattress) to the base in a fashionable style. Once you are happy with your foam you simple cover it in builders bog.
Lastly you will have to cut a box shape out of the top of your staff, the reason for this? Your staff will go inside the body of the staff head, and this is where you will place your battery pack
Step 7: The orb
To make the right shape, I used Plasticine, made the desired shape, sprayed it with canola spray, then coated it in a few layers of liquid latex. The liquid latex is to make a mold for casting the resin.
Once you have made a mold about 4mm thick, you then need to make a 2 part mother mold to make sure it doesnt stretch when you do your casting, I used plaster of paris as this does not to be a fancy casting.
Simply make a border around your latex where the plaster will be cast, layer your plaster, remove Plasticine, and with a piece of gladwrap on the other half, cast your other half of plaster (the gladwrap stops the plaster from sticking to itself).
Now simply open up your plaster mold, remove Plasticine from latex, fit latex back into plaster, and BAM, your ready to pour.
The Clear cast resin is something that is usually very particular about mixing quantities, so make sure regardless of which brand you get that you read the instructions.
Once mixed, by simply adding blue craft dye or food colouring you can color your cast, I used about 5 drops of blue food coloring for mine.