15 mm
The pseudo-amphibioid natives of the jungle world Kwiell were progressing well through their version of the Bronze Age when the first sky visitors arrived. Unfortunately for the Ikwen ("the Forest's Children" in their own language of hypersonic clicks and squeals) the visitors were not a curious scientific team, but a fleet of freebooters hired by the Human Empire to scout out sources of the fusion-modulating superheavy element unbihexium.
Upon learning of the Ikwen, the Empire ordered its contractors to not only extract the planet's unbihexium, but capture thousands of the Forest's Children as slave labourers. Their resistance with primitive weapons would have been doomed if not for the hasty arrival of military advisors and equipment from both the Cultural Collective and the Garafraxian "Chloros", hoping to starve the Empire of a strategic resource. Now the Ikwen find themselves in the middle of a three-way proxy war, with their own home hanging in the balance...
Figures are from Loud Ninja Games via 15mm.co.uk, with thanks to Eli Arndt, Todd Ulrich and Roderick Campbell for creating such a cool species! :)