[] The old leader has died, seemingly peacefully, though you can't always be sure. Loved by the Hive, if not always the best leader, their apparatus and government is partially intact, annoying when/if you want to make a clean sweep, as you MUST, and build your own system (other than the obvious things that remain budgeted.) Expect loyalists everywhere, secrets, suspicions that you are betraying their legacy, that sort of thing.
[] The old leader grew corrupt, separated from the people, and you have seen fit to correct them. You now rule and the shattered remnants of this old government are of course bitter from the loss of privilege and would happily take it all back or ingratiate themselves to you with their bad and disastrous policies and their secret police and...all of that.
[] Once, the Caste of the Ruler reigned, but no longer! Revolution, as the old and corrupt forces are swept out! But that means that the caste of the ruler yet stands, the castes in general are going to be watching you, and it's not an established tradition! Choose one of the two.
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Velvet Revolution: Hundreds of millions marched, protested. The police came and beat them and still they stood. Spies denounced disloyalists and calls were made to stand together against the foe. The holocasts denounced the protesters as mere rabble-rousers, and still they stood. Stood and marched and met and spoke, wrote books and papers and presented their will to the whole of the world-Hive. And a million marched, hand in hand, upon the capital. Upon the palace, upon the place where the Monarch yet resided. The police paused, the defense forces sat upon the barricade, guns trained. And they did not fire. Would not fire. The Monarch yelled, barked orders, and forward came the wave of Xvorzit, holding hands, singing Bazkhiti songs, waving banners, unarmed but for the power of their presence, but for their songs. Compared to the heavily-armored defense forces they might as well have been naked. In that shimmering night, the old order was swept aside, and now by some process you are declared the new ruler. The caste of rulers yet stands, and their bureaucrats need to be swept aside more fully, and certainly, not discredited if only because the police didn't fire, you shall have to deal with them. (Reward: Feels, lots of feels. A peaceful revolution. Seriously, just picture the march...)
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Blood on the Velvet: There were riots, and deaths. Thousands upon thousands died. It could have been far worse, it wasn't a civil war, but in the end the police obeyed orders, in the end you stepped up, did what you had to do, acted as a leader and by this leadership you won. Blood and chitin and the will of the people. And so now the Bureaucrats stand hunted fugitives, the caste of rulers are either dead or worse, fugitives, terrorists who wish for nothing more than your death. The castes fear the might you showed, to channel and control the people's will. They fear that you are exceptional, they fear that you shall shake them from their petty privileges, that you shall remake the world into a better one. They are right to fear. (Reward: Gain one more trait-point and another Lifestyle trait to compensate for the added difficulty of this path! You'll need it.)