Zip lines, if my base is high and I need to quickly get down sliding down the cliffside isn’t an option for me, elevator takes to long an can be destroyed while on it. Ziplining straight down is the better option to attack my attackers or just traversing in general
Spyglass, so I can scout without being seen or having to run right up on a base to check the door to see the name or using a hammer on a foundation dodging all the thralls this way we can scout from a distance.