Napftor
Explorer
Without a doubt I would pen some kind of "big finish". Since I normally develop a major story in 4+ modules, having only 2 to finish a campaign would require something extra special and unusual. It would involve time travel of some kind. Probably back to the formation of the current party (if they had been together for a significant time period) to change something they had done. But this would be part II of the finale.
Part I sees the PC's (and the area they call home) being assaulted by a foe that has, until this time, been virtually unencountered. The time travel thing comes into play because this uber-villain only came about as a result of the party defeating another villain after soon after they started adventuring. More specific details would depend on the PC's themselves and I would make sure to include something in the two-parter that meant something to each PC personally.
Part I sees the PC's (and the area they call home) being assaulted by a foe that has, until this time, been virtually unencountered. The time travel thing comes into play because this uber-villain only came about as a result of the party defeating another villain after soon after they started adventuring. More specific details would depend on the PC's themselves and I would make sure to include something in the two-parter that meant something to each PC personally.