They are often summoned by dwarf spellcasters to be bound in the Material Plane as their guardians or mining workers. Their temperament is very similar to that of dwarves: hardworking, blunt and straightforward, perseverant, and they are usually very willing to serve dwarves.
This is essentially a biological version of a demolition hammer, perfectly complementing the gnoll tremor bomb for mining.
The deep burial explosion of the gnoll tremor bomb can split large sections of iron ore directly from the rock, but due to the difficulty of breaking and transportation issues, they often have to sacrifice blast quantity for pulverizing energy focusing on smashing the iron ore.
With this group of stone spikes with different models, there's no such concern.
It's entirely possible to maximize the blasting capability of the tremor bombs, handing large pieces of iron ore to large stone spikes and small pieces to smaller ones, quickly breaking them to a satisfactory extent.
