Die in my hands s a horror add-on for Minecraft Bedrock built around two stalking creatures.
Window Stalker: every few minutes, a hollow-eyed creature briefly appears in a nearby window and vanishes.
Door Stalker: every few minutes, a tall creature appears at your front door. You'll hear its footsteps getting closer. If it's standing right behind you when you turn around, it's already too late.
Fully configurable in-game with /scriptevent horror:config (interval, search radius, on/off, manual test for each), or trigger both instantly with /function horror/spawn.
And more.

