Basically your only way of survival in Blackreach

similar to jug bug in scorched earth up if u think they should add the jug bug

I think they are immortal, right?

You can put them in a wood cage. Hence free light. Just not sure if or when they despawn.

put. charge pet on your should IEbulbdog,featherlight,glowtail,glowhorn. and press e on the bug your pet will take up to 500 of the bugs charge a charge batery in your inventory works also.

its also a good early game chitin and meat.

It Glows

Honestly

all it does it glow

should be able to be captured in jars for light

If you want a charging station for batteries, you either find one or put a battery into these guys. Try to trap a bunch of them in a enclosure and you will have a charging station next to your base. A substitute choice, just make a base next to a charging station

Kill it for chitin and charge.