Shape Shifter

We're going 3D!

As hinted by the clue of gong 3D, these 12 pentagons can be cut out and assembled to make a Dodecahedron.

Dodecahedron

Each of the vertices can combine the 3 strings of letters to make an Otherside resource, environment or artifact that is missing one letter (https://www.otherside-wiki.xyz/otherdeed/resource). The assembled Dodecahedron in its flattened state is shown below (it can be printed, cut out and folded to make the final 3D shape)

The reassembled letters and their corresponding Otherside word are listed below (A-Z order)

Otherside Word
arch-iPel-ago
bonE-st-one
bot-aNi-cal
bu-bo-Nium
coSm-icd-ream
crY-st-al
eLe-me-nt
enVir-onme-nts
frAg-men-tia
hol-low-ciNe
la-pId-ite
mag-en-tiA
monk-eyb-arRel
no-ctu-rnA
pry-sma-tIca
reLi-cca-rd
rot-wo-Rth
shat-ter-frOst
ste-ppe-sAlt
tho-rnw-ooD

With the completed words, reading the missing letters with the list in A-Z order reveals the final answer of PENNSYLVANIA RAILROAD