Heya folks, just got the demo for this game and there are a few things I am rather confused about. The first time I started I didn't thoroughly read the tooltips and such so I got lost as to what to do rather quickly.

A second time I realize how the game works much better but I am trying to set up my first pentagram (beyond the first one you find very early in the demo). I found an underground grave with 12 population points so I spent some gold and set up a pentagram to summon some warriors. I placed it down but it says it isn't activated and that I need a goblin to activate it. For the life of me I cannot figure out how to do that. :/

So I figured I'd find the games forum and ask.

it's the begin of the second level?
if yes, then look around. there's a jailed goblin beside a closed hero gate.
attack the prison to uncage the helpfully toddler.

later you are able to summon goblins with a spell.
open your grimoire (default key "b") and drag the spell into the spellbar.

Once you have a goblin just leave him and he will run over and activate it if he can reach it

Yea I figured it out. The pentagram needs to be placed 'inside' my area of influence for them to activate.