Lord Zardoz
Explorer
The Githyanki Incursion
I will first state that I know very little about your campaign other then what your above comments have stated. That being said, your aims are quite clear, and specific knowledge is probably not needed.
As you say, your players will probably want to go ahead and swat the Githyanki Incursion out of existence for the sake of kicking ass. You just want to make sure that you do not spend 2 hours rolling dice to kill an army whose fate was sealed the moment the players showed up. And getting the players intrested on a personal level in wiping out large masses of cannon fodder (albeit premium grade A fodder) is that you no longer have a particular NPC to act as a focal point for the players efforts.
Here then, is my suggestion: Let the Githyanki break the rules a bit.
What if the Githyanki have found a way to tap the resources of thier own dead to fuel their army? Lets say that the Queen has struck some deal with your campaigns death god. For each Githyanki that should be bound to damnation, the Queen will send 2 non gith souls in their place. This can be made possible by whatever means you find most expedient. An Epic spell, a powerful artifact, some arbitrary cosmic phenomenon, or some combination.
The players catch wind of this when some ally tells them that people slain by a Githyanki are not being raised. You can also have some Near epic Githyanki villians show up, get trounced, and show up again within hours ready to fight. Or perhaps they just wont die. They will bleed alot, and scream, but they just will not go on to their well deserved afterlife.
The happy result of this is that you can feel completely justified in sending high level opponents at your players who get trounced without it screwing up the demographics of your campaign. Your not creating 500 20th level opponnents for your players, your simply using the same 15 over and over again.
When the players realize that they are going to have to kill the queen, AND figure out how to restore the souls killed by the githyanki to their rightful place, they will have a cosmically important task before them. And you can let your players discover that the entity that helped the githyanki queen do this is your shadow lord, and that he increased his own power base in the bargain with the Gith queen, your players will have that much more reason to be unhappy.
END COMMUNICATION
I will first state that I know very little about your campaign other then what your above comments have stated. That being said, your aims are quite clear, and specific knowledge is probably not needed.
As you say, your players will probably want to go ahead and swat the Githyanki Incursion out of existence for the sake of kicking ass. You just want to make sure that you do not spend 2 hours rolling dice to kill an army whose fate was sealed the moment the players showed up. And getting the players intrested on a personal level in wiping out large masses of cannon fodder (albeit premium grade A fodder) is that you no longer have a particular NPC to act as a focal point for the players efforts.
Here then, is my suggestion: Let the Githyanki break the rules a bit.
What if the Githyanki have found a way to tap the resources of thier own dead to fuel their army? Lets say that the Queen has struck some deal with your campaigns death god. For each Githyanki that should be bound to damnation, the Queen will send 2 non gith souls in their place. This can be made possible by whatever means you find most expedient. An Epic spell, a powerful artifact, some arbitrary cosmic phenomenon, or some combination.
The players catch wind of this when some ally tells them that people slain by a Githyanki are not being raised. You can also have some Near epic Githyanki villians show up, get trounced, and show up again within hours ready to fight. Or perhaps they just wont die. They will bleed alot, and scream, but they just will not go on to their well deserved afterlife.
The happy result of this is that you can feel completely justified in sending high level opponents at your players who get trounced without it screwing up the demographics of your campaign. Your not creating 500 20th level opponnents for your players, your simply using the same 15 over and over again.
When the players realize that they are going to have to kill the queen, AND figure out how to restore the souls killed by the githyanki to their rightful place, they will have a cosmically important task before them. And you can let your players discover that the entity that helped the githyanki queen do this is your shadow lord, and that he increased his own power base in the bargain with the Gith queen, your players will have that much more reason to be unhappy.
END COMMUNICATION