Thinking of the future of the 9th Age, having only 4 Dark Gods is kind of limiting. What if the original 4 (Change, Lust, Pestilence, and Wrath) are only the four Dark Gods that are currently in ascendance? What if the Pantheon of Dark Gods more resembled the 7 Deadly Sins rather than the GW Gods? If you wanted to twist that a bit farther to include Change and Pestilence, it could easily be the 9 Deadly sins.
Change,Envy, Gluttony, Greed, Lust, Pestilence,Pride, Sloth, and Wrath. Though Pestilence doesn't really fit in that lineup. Pestilence could be converted over to Gluttony with zero effort.
Seven deadly gods,seven ways to prod, seven holy paths to hell, and your trip begins Seven downward slopes seven bloodied hopes seven are your burning fires,seven your desires…— From The Child of the Sun,by Eiserne Jungfrau, Sunnan prelate and poet
I would love to read stories and lore on this