I'm not a power fantasy guy, I don't want to upend societies after a single quest.
You can have power fantasy with elaborate and well thought plans that justify any drastic change. Take the place of Sarevok in baldurs gate 1, this is what his
dark power fantasy was about:
Step 1: Poisoning the Iron Supply
Sarevok's agents infiltrated the Nashkel Mines, the primary source of iron for the region. They tainted the ore with a subtle poison derived from Durlag's Tower. This didn't just spoil the raw ore; it cursed all weapons and armor forged from it to crumble into rust and dust after minimal use. This created region-wide panic as essential tools and defenses failed.
Step 2: Highway Robbery and Famine
To exacerbate the shortage, Sarevok hired a vast bandit army, led by the half-orc Tazok. These bandits systematically raided legitimate shipments of untainted iron along the Coast Way and the Trade Way, cutting off the normal supply chain and driving up prices exponentially.
Step 3: Sabotage of Competition
Sarevok used the mercenary group the Iron Throne, of which his adoptive father Rieltar was a leader, as his primary vehicle. He systematically sabotaged rival merchant organizations, particularly the Seven Suns and the Merchant's League in Baldur's Gate, using doppelgangers to disrupt their operations from within and eliminate leaders.
Step 4: Pinning the Blame on Amn
As tensions rose, Sarevok strategically spread rumors and misinformation implicating the southern nation of Amn in the crisis. This turned an economic problem into a potential international conflict, stoking nationalist outrage in Baldur's Gate.
Step 5: Gaining Public Trust and Control of the Iron Throne
The Iron Throne, now largely under Sarevok's command, offered to be the city's salvation by providing a
new, untouched source of iron from the Cloakwood Mines (controlled by the villainous mage Demin, whom Sarevok had co-opted). Sarevok presented himself as the only man capable of securing resources and defending the city. Simultaneously, he had his father, Rieltar, assassinated at the merchant organization's headquarters, ensuring his full command of the criminal empire.
Step 6: Eliminating Political Rivals
Sarevok began a spree of assassinations targeting anyone who stood in his way of becoming a Grand Duke, the highest governing title in the city.
Step 7: The Coronation Plot
With public support and the only remaining Grand Duke, Ulder Ravengard (leader of the Flaming Fist), conveniently away leading troops to the Amn border, Sarevok was nominated to fill the vacant Grand Duke seat. His plan was to secure the title legally and officially declare war on Amn immediately following his coronation.
Step 8: The Ritual of Ascension
Sarevok needed a massive war to create sufficient carnage, but he also needed a specific, potent source of death: his own Bhaalspawn siblings. He attempted to eliminate the player character and others early on. Ultimately, the war itself was the main ritual.
The whole plan was to create a massive war to fuel his chance to ascend to godhood.