This is for a commission.
Lantern Marines are Dark Angels successors, Monastic but with a Tiki/Polynesian native origin that shows in their armour.
They have Lanterns hanging on their backpacks that can, if nothing else is available, be used as powerweapons.
This was all in the brief (though I shortened it down).
They also have sort of a metal-rock theme going on, which explains some flame-motiefs.