The players may well have their characters head back to town and rest for extended periods before heading deeper into the castle. This is perfectly reasonable. But Eliazu will try to convince them not to, or at least not to tell anyone about the secrets they’ve discovered. Eliazu will not want a big party of investigators running through the castle. Eliazu will remind the players that if they bring anybody up, they’ll have to share any treasure. If there is anything else that Eliazu knows about the characters’ desires that can be used in a subtle manner, use that also. Also—Eliazu won’t know this, but anyone familiar with the Tutors will—the Tutors will take anything that is remotely of historical value.
Eliazu will try to summon or create creatures to assist it against the player characters. If it has any source of fear, it can replace any lost demonic power. Attracting evil creatures takes time. First of all, there have to be evil creatures in range, such as on the path below the castle. Then, Eliazu can only influence two or three of them, in hopes that all will follow. All it can give them is a little nudge, a little snippet of desire for an abandoned castle or a broken tower. Once they stay inside the castle for a while, Eliazu will work further on improving its influence over them.
If they go back to town, the kind of assistance they receive will depend on how they go about getting it. Any proof that there is a completely unexplored level beneath the castle will result in numerous groups and individuals heading up to the castle. A few individuals will probably arrive first. The Tutors, experienced at taking advantage of new knowledge, will probably arrive second. Eliazu will choose people of power and low will and try to influence them. “This castle could all be yours, with the right laws.” Eliazu might suggest to a weak-willed sorceror, especially one with political power, that this place must be on a place of power. Eliazu will try to limit access to a small group of people who have or can reasonably be shown the power to set the demon free, and who can be tricked or influenced into doing so.
If the characters bring it only to the attention of the Tutors, the Tutors will keep it a secret, at least until they’ve been able to explore the place. How the Tutors handle it, and how much they keep the player characters in the loop, will depend on the PC’s relationship with the Tutors.
There will be a lot of political fallout over the discovery of the new level. Eliazu will take advantage of that as well. Remember that Eliazu isn’t yet powerful. The demon can make many suggestions, but actually nudging someone to a course of action affords them a reaction against the nudge, and it costs demonic power.
You probably do not want to have the Tutors save the day. That’s a boring story. Let a splinter group move their base of operations to the castle. This splinter group will come further and further under the influence of Eliazu. The characters (perhaps in conjunction with the Biblyon Tutors) will eventually, at a higher level, need to face off with Eliazu and Eliazu’s Tutor spies, sorcerors, and warriors, perhaps to stop them from freeing Eliazu, or to send a freed Eliazu back to the shell.
