Here are my 2 cents, assuming your DM is trying to challenge you..
- Have you asked around in temples or cities how do they manage or know about this kind of undead?
- They resist attacks like holy water, silvered weapons, uncommon matherials (mithril, maybe darkwood vampire-style?)...?
- Have you tried Align Weapon (Clr 2), maybe good damage won't heal? If this works, you cleric could craft some Sacred Scabbards (MIC, 183) for you.
Your cleric could craft one or more Radiant Spheres (MIC, 172) wich has 3 charges/day and can deal 4d6 "pure light" damage to undead for every charge. Expanding a daily use of turn undead the cleric can recharge it.
Assuming they retain some undead traits, like immunity to criticals and suffocation damage, they could retain positive energy weakness. If so, beat em up till they collapse and then let the cleric heal them to death. The regeneration, being a Su ability, could be not a source of positive energy in this monsters, but negative instead.
If you really can't hurt them:
Tie them with chains and locks. The STR DC to break a chain is 26, so wrapping 2 chains (like a braid) to make them break together should be around 50. Then get some poles and hang them up in a thin cage where they can't move, should grant a penalty on every action wich requires movement, including str checks and attacks. Pretty medieval...
Ah, you can repair rusting iron object with Make Whole (Clr2)
Find a rocky mountain, let the cleric dig in the stone with Stone Shape a room with the only entrance on the roof, kinda a well. Drop the bodies down there until you find a way to deal with them. With enough time, your cleric can shape a pretty big and tall room. Being a 3rd level spell, he could find some other cleric too, or maybe some dwarfs or everione else who can hold a pick, willing to help.
Eventually they will crumble to dust. But, you need a serious way to kill them wich maybe requires a plot advancement of some kind, or the world will collapse under this unstoppable menace O_O
- Have you asked around in temples or cities how do they manage or know about this kind of undead?
- They resist attacks like holy water, silvered weapons, uncommon matherials (mithril, maybe darkwood vampire-style?)...?
- Have you tried Align Weapon (Clr 2), maybe good damage won't heal? If this works, you cleric could craft some Sacred Scabbards (MIC, 183) for you.
Your cleric could craft one or more Radiant Spheres (MIC, 172) wich has 3 charges/day and can deal 4d6 "pure light" damage to undead for every charge. Expanding a daily use of turn undead the cleric can recharge it.
Assuming they retain some undead traits, like immunity to criticals and suffocation damage, they could retain positive energy weakness. If so, beat em up till they collapse and then let the cleric heal them to death. The regeneration, being a Su ability, could be not a source of positive energy in this monsters, but negative instead.
If you really can't hurt them:
Tie them with chains and locks. The STR DC to break a chain is 26, so wrapping 2 chains (like a braid) to make them break together should be around 50. Then get some poles and hang them up in a thin cage where they can't move, should grant a penalty on every action wich requires movement, including str checks and attacks. Pretty medieval...
Ah, you can repair rusting iron object with Make Whole (Clr2)
Find a rocky mountain, let the cleric dig in the stone with Stone Shape a room with the only entrance on the roof, kinda a well. Drop the bodies down there until you find a way to deal with them. With enough time, your cleric can shape a pretty big and tall room. Being a 3rd level spell, he could find some other cleric too, or maybe some dwarfs or everione else who can hold a pick, willing to help.
Eventually they will crumble to dust. But, you need a serious way to kill them wich maybe requires a plot advancement of some kind, or the world will collapse under this unstoppable menace O_O
