THEY CAN'T HANDLE DEMOCRACY

A voter declines to participate in exit poll. 

The subterranean humanoids, burned by generations of rule by an increasingly insane super-rich aristocracy, decide to give democracy a whirl.

Supreme Overlord Election Results
d12
1. The most physically attractive candidate wins by keeping mouth shut, relying on pure sex appeal
2. Witch with strong maternal instincts convinces populace of need for guidance from an authority beyond the petty concerns of clan and faction, proposes defense updates including impenetrable dome of darkness, will bolster fecundity with new emphasis on loosening sexual mores, swinging bacchanals
3. Huge lump of alien fungus capable of speech and convincing mimicry of intelligence, bio-logarithms generate semi-impenetrable yet competent-sounding pronouncements, responses, voters approve of extreme outsider status
4. The General runs on a platform of prejudice, hostility, aggression, greed, immediate war with neighbors to bolster short term economic concerns, will put languid, decadent population back to work or on the march
5. Wizard from the surface world offers favorable trade agreement with human empires, import novel goods, foodstuffs, slaves, favorable export deal for Underspirits, wicked Underworld arms, highly addictive , ultimately lethal smokable fungi crop
6. Blowhard with 18 Charisma runs on pure bullshit, intimidation, rages against false intellectual tyranny of the smarty-pants class, knows how to handle aristocrats, private army: ostensibly bodyguards but straight up goons poised for Night of the Long Knives-style action
7. High priest of the Worm Sultan makes a hell of an impression with live endorsement appearance by the godling itself
8. The Master Inquisitor of Nul the Mindless God sways the vote with demonstrations of the blessings of mindlessness, economic boon of massive construction contracts paid for entirely by cult monies (fabulous temple to be installed in center of subterranean city following demolition of temples to rival gods)
9. Zealot of obscure godling of the downtrodden fans flames of class resentment, within hours of election mass decapitation of the rich begins, very loosely organized redistribution of wealth follows
10. Traditionalist candidate promises a return to hard-ass asceticism/ultra-violence of the good old days, "a cuirass and sword for every child", each morning begun by marching up and down the square
11. Familiar old aristocrat wins by a landslide of "better the devil we know" sentiment
12. Roll twice more: popular vote goes to first result, electoral college goes to second, both sides immediately activate assassins and attempt simultaneous purge

The Opposition Reacts
d6
1-2. Multiple assassins activated to be followed by bloody purge
2. Factions left out in the cold engineer immediate civil disobedience to be followed by bloody rioting
3. Public smear campaign, dirt dredged up (or made up) and spilled all over the public square, legal case made for impeachment
5. Temporary shocked paralysis, impotent hand-wringing
6. Consumed by in-fighting, recriminations, murderous self-destruction inevitable