Mutaxol:
The Twelvers ruled the northern half of the continent, but some of their citizens... began to question their allegiance to distant coastal cities. Of course, society was dependant upon whale-stuff imported from said coastal cities, so most people recognised that rocking the boat would do them no good. But those who didn't caused trouble, especially as increased industrialisation led to inland regions gaining greater prosperity- they began to argue that they could survive alone. Occasionally, they needed to be reminded of the benefits of cooperation. A bullet to the head served well to clear their thoughts.
Furthest south, the Twelve Bay Confederation did not take any risks. An uprising on the border could potentially be exploited by the southern barbarians to expand their territory, so forces were constantly stationed in the region to discourage disloyalty and quickly put down anyone who didn't get the message. Naturally, these permanent armies could only be led by Wovenmen. Which... was a problem.
The Wovenmen, pinnacles of the Protectors, felt the pressure of modernity just like everyone else. With thunderarms becoming more and more efficient, their status as Protectors became more and more symbolic- their crude augmentations no longer provided an unbeatable advantage on the battlefield. In the Twelve Bays themselves, this was harder to notice- not a lot of conflicts in which their inadequacy could be demonstrated. In the south, though, it became glaringly obvious.
So, after many centuries of making only incremental improvements to their implants, a council of Wovenmen finally permitted radical new research in the field.
MECHANICS
The scientific establishment was unleashed. They demystified the Wovenmen, isolating the substance that allowed their crude techniques to work at all. Dubbed Mutaxol, extracted from Whaleblood through alchemical processes, the substance enabled flesh to be shaped and bonded to other materials. This allowed for new, safer, more extensive, more powerful implants to be designed. These implants were developed in the border regions, both because that allowed them to quickly be tested, and because it kept them as far away from the existing Wovenmen as possible- though they had recognised the need for reform, they didn't like it.
Whaleblood tattoos made way for Orichalcum implants that gave far greater control over cetricity. Crude flesh-pockets were replaced by sterilised injection ports, where alchemical serums could be safely introduced to the body in controlled dosages. Some even created entire prosthetic limbs, connected directly to the nervous system, with full range of motion- and some extra hidden fun stuff, like built-in whalelocks, blades, or ichor truncheons. They even- at the insistence of the Wovenmen- designed improved self-destruction devices, both more reliable (harder to trigger accidentally) and more potent.
When the Wovenmen elders saw what science had wrought, they were forced to acknowledge its superiority. Future generations of Wovenmen would adopt more and more of these innovations, reclaiming their position as peak Protectors.