4zb4 wrote
EDIT: Had a look at other roguelike ultra-endings and I'm not very impressed that some require stupid stuff like killing the right monster first or doing things in an extremely restrictive manner.
Heh, ADOM is quite weird...
Anyway, I would love to see an ultra-ending where you could fight a god. Maybe each of the current two main dungeons could offer a different god to kill?
For example, in GC you would need to steal the avatar of Valpurus from Cathedral and bring it to Oree's lair, where there is the second unused portal. The daemons were planning an assault on the place where Valpurus lives and with his avater, you can open the portal and lead an army of daemons against angels of Valurus and even Valpurus himself. Defeating him would allow you to either take his place as the King of Gods, or help Mortifer destroy the whole world and becoming a demigod as reward.
In TX, on the other hand, you could take the skull of Xinroch and bring it back to Attnam. Here you could talk to Petrus, who would offer you to use to skull to open a portal to the throne room of Moritfer. You would battle Mortifer and kill him, allowing you to either take his place as the main god of Chaos, or destroy the source of Chaos once and for all, so that Valpurus could conquer and rule over the whole world forever, with you as his demigod.
This covers both law and chaos endings, so you can choose which you favour more.

And you can become a (demi)god, which is cool. Plus you have a reason to talk to Petrus even if you pick TX.
EDIT: Not related to ultra-endings, but what if TX had a special level where an enemy with Eptyron from CLIVAN spawns? That would a) present a unique obstacle, to better differentiate TX from GC, b) let us use material softening mechanic, which is cool, but would be infuriating on normal enemies - special enemy, however, would present an interesting risk, c) add an artifact axe which IVAN sorely lacks.