So in Swords & Wizardry Complete, druids all belong to a single world-spanning druidic hierarchy that you have to fight your way up to the top of to become the arch-druid.
In Necrocarcerus, druids are employees of the utility companies (obviously), and the druidic hierarchies are the four utility companies, and you have to fight your way to the top of the corporate ladder to reach 20th level, where instead of becoming the arch-druid, you become the CDO (Chief Druidic Officer) and help maintain the natural balance of Necrocarcerus by ensuring oil flows, electricity is generated (the sun is replaced regularly and on-time), water gets purified and moved around (and Ocean Null doesn't accidentally drain out into Necrocarcerus), and phone calls and packages circulate smoothly. You spend your mid-levels in druidic middle-management, overseeing the construction of the animal-likes and plant-likes that constitute the ecology of Necrocarcerus and learning about nature crap like where the fans that keep everyone from choking to death on smog are and how they work and where the secret phones are hidden. At lower levels, you're probably responsible for some local domain, making sure people are paying their utility bills on time and collecting money / their heads when they don't (esp. monsters, who are notoriously tardy debtors). Yes, you still have to challenge and defeat higher level druids to move up - you don't get to be a druidic Regional Vice President of Sales without showing you've got the killer instinct a closer needs.
The druid secret language is just Elemental with a lot of management jargon thrown in, and it evolves fast enough that no one outside the utilities can ever keep it straight.