I had an idea while experimenting with chaos plane recently (kudos to irc channel regulars that spectated).

Andor Drakon refuses to take any of the chaos items that are (g)iven to him.
Of course, for the most part the PC doesn't want to make him stronger but from the flavor point of view, it could be made so that he accepts the items.
His response could be something like "Thanks mortal! You have just made me much more powerful!" and proceed to attack the player with triple HP or speed or maybe start to ignore PV?

Also, players commonly drop chaos insignia (crown, medal) right after passing through the chaos gate, because carrying them around adds even more to an already extremely corrupting area.
What if dropping them and stepping off could result in the chaos god instantly teleporting on that tile, picking them up and equipping for some nice bonuses against the player (like mentioned above)?
This would be another flavor point.
My PC in question was C- pretender to the tile of ultimate chaos god (I had the trident) but I have also recovered the scepter from I:66.
I tried to give it to Andy but he refused to take it.

The idea behind all this is that making him much, much more powerful with items that contain the essence of chaos and corruption could be reflected in the final score somehow (and include steel artifacts from Kherab and boots of great speed).
This could also work nicely in synergy with the following change:
http://www.adom.de/forums/project.php?issueid=2680