Guard Duty, obviously.

Sighing, you set your... honestly kinda crummy... new minions to stand in the shadows along the main door of the tower, ready to attack any hostile that enters. The bat flutters back out the door, probably off to go sleep in the rafters. You nod to yourself- this is as secure as you can make your new home for the time being. You're going to need to get more corpses or figure out summoning to acquire more minions, and find out how to make traps and wards in order to add passive defenses.

Like it or not, you're going to need both minions and passive defenses- killing off the orc scouts has effectively guaranteed that you're going to be in conflict with them, never mind whatever the 'players' get up to. Too bad you know next to nothing about summoning and warding. Still, you've got that summoning circle, so it probably won't hurt to go ahead and upgrade it. Shrugging, you authorize doing so only to be met with an error report.

Error: Cannot upgrade summoning circle.

Upgrading circle would break it, releasing outsider contained within. Banish or recruit outsider first.

Well. That announcement is all sorts of concerning. The most immediately concerning one was that you hadn't seen any outsider during your clearing of the tower earlier. Admittedly, you also hadn't seen the summoning circle either. Which, of course, means you need to locate the circle and whatever it contains. Or whoever, you suppose.