Banging out a few ideas for special equipment for the horde.
The majority of the experiments done on the Goblin Horde is in alchemical vats. Despite the technological breakthroughs surrounding the ingenious nature of the vats, they nothing short of fatal to the majority of the goblins that are exposed to them. Science is capable of amazing leaps when there is little to no concern paid to the comfort and survival of the test subjects.
Fireball is the bane of the Goblin horde and Energy Substitution only compounds the problem. The Elemental Vats were first created to stack elementally aligned subtypes onto goblins to grant them the immunities (and vulnerabilities) that are associated with those subtypes. Immersion in elemental vats for any creature that is not a Goblin is fatal, inflicting 10d6 (no save) points of damage of the corresponding energy type each round the target is immersed. All elemental vats have an onset of immediate. Elemental vats are typically covered with iron cage tops to prevent the subjects from escaping and inflict agonizing pain, even on their intended target. During the transformation, the Goblin absorbs the fluid contents in the Vat which results in the need to replace the liquids within. This typically costs one tenth the market value of the Vat and must be refilled every 24 hours of use. A goblin may only ever “benefit” from one Vat, exposing the goblin to a second Vat causes it to automatically fail its Fortitude saving throws. Roughly 1 in 10 goblins survive an encounter with an elemental vat. An elemental vat run continually can produce roughly 2 elemental goblins a day provided it is continually refilled with the necessary alchemical ingredients.
These vats are designed to create goblins and more advanced goblinoid lifeforms.