Maybe here's not quite the right place for it - though it DOES contain an idea of mine.
Currently, city/guild dynamics are hilariously one-sided. If a city and a guild don't get along, the guild can do a grand total of nothing except complain and try to replace city leadership, while the city has a whole host of powers available to them (enemy status/take away the guildhall, break treaties/jack up comm prices, remove members from the city (thus taking away their access to ylem stuff)). So, my idea'd be this: some minor ylem boosts for GUILDS (let them have their own pylons/maybe allow their pylons to interact?) This'd let people in guilds and not a city have some perks too, while also giving maybe a small bargaining chip for the guilds to use against the city. Also, each guild has a guard type associated with it - in an EXTREME case, have some way to 'disable' that guard type. GUILD PROTEST could be used to neutralize the guards belonging to whatever guild they're a part of - city relations with a guild are now important, TREATIES MATTER and can actually be somewhat enforced, and there's actually room for negotiating. I don't tend to like one-sided power dynamics, and I'm curious what else people can come up with.