Roaches would be a cool tanky tier four bug. They would only spawn in very certain places (so early players could avoid these beasts); most likely in a moist area (maybe even in a new biome, like in a swamp or trash area .) They would be pretty much impossible to kill on their own, so you would need to use poison to attack them. You would most likely find this roach poison in the shed (in powder form), and would probably need a shovel and gas mask to harvest it. You could then combine with any of the three human foods to make roach poison. You would then go to the area where the roaches live,