Quick help with encounter

By Charter, in Game Masters

Hello fellow GMs,

I require aid as I'm currently setting up for the next session for my group and we'll be playing in a couple of hours (as of this post obviously). The only thing I need help with (or at the moment anyway) is how to deal with an encounter involving a 'repellent' device and the local wildlife.

The juist is this: The planet the PCs are on is constantly foggy, a type of fog that's also hard to get a com-signal through. The dominate species ('Bugs' we'll call them) of the planet are cannibalistic but will work as a co-ordinated group to take down new prey. They are blind creatures, so they locate their prey by other means (not fully fleshed out yet). To deter these creatures, PCs will have access to a 'sonic emitter' to keep the buggers away. Unfortunatly, a type of blind Rancor lives on the planet that uses similar senses to the Bugs but unlike the Bugs, they will try to locate the source of the emitter and attempt to destroy it.

What I'm envisioning: Basically, Bugs will swarm all around the PCs and keep a safe distance away because of the emitter. Bugs run away, ignoring the emitter, if they hear a/the rancors. The rancors don't care for the PCs until they get into medium range with said device. If PCs turn off device, Rancor ignores them while the Bugs will keep out of sight of the rancor. How should I convey to the PCs that too strong of a signal could draw unwanted 'friends'? This is also because of the baddies on the planet have such an amplifiable device, if they so wish to use it.

Any other questions for clarification or details are welcomed, if necessary. Thanks!

Seems like if they know enough to use the sonic device, the how to use it properly should probably be in the owner's manual....

Your only warning should be a Destiny point flip just before the Rancors appear. It lessens the blow of a plot twist when the players get something out of it.

Can they tell where the bugs are? If so you could have them notice the bugs moving away from where the rancor(s) will appear, or they could roll perception if you want them to have a chance of not noticing.

Session went well. Players fled from the rancors so no need to worry about it apparently. Thanks for your responses!