Hill didn't think the Styx, with whom he had a brief conversation, would care about the Undead Tribe.
To him, these souls don't belong to him at all, no matter what is done; anyway, the Undead Tribe definitely won't massively steal his souls.
The fact that the Styx doesn't even mind the deities fishing souls out from him shows just what 'a lot' really means to him.
It's like this world, where for thousands of years hardly any souls entered the Styx, and its tributaries were nearly severed before he slowly reacted.
Moreover, his resistance was particularly weak, obviously just a gentle wave of the paw, if they go away fine, if not, so be it.
What made the Styx choose to closely watch the Undead Tribe... it must be because of Lansendel, right?
The endlessly congested Styx of Toril must have left a deep impression on the old man, making him go crazy.
