Sinister doesnt do much. Try a Terrifying area.
And good luck finding any wormy tendrils or staring eyeballs, all I get is Glumprogs.
How do you guys get your migrants in the door without all the critters coming in?
Roads with walls and on the sides help if you wanna bunker.
Cage traps all over the entrance, with marksdwarf support.
If you dont have a roof over your head the zombie barn owl men will get in regardless of what you do. Even having their wings rotted to the bone doesnt remove their flight abilites.
Usually its best to have a little patch of normal savage biome that you can use where things can die when they are killed and STAY DEAD.