As it turns out, its harder to climb a rope over big spikes, then use one to climb up a wall or tree...
Buckthorn: you easily walk across, but then flub the climb right towards the end. You fall on spikes.
Nar-Haru: You also fall, on the trap, spikes go everywhere.
Ghen: You make it through most of the pit, but stop when you see the spikes fly and Forge is stunned. You think you are out of the spikes range.
....
Buckthorn, for first falling on spikes then getting spiked, and Nar haru, for doing the same but faster, you each take 19 damage, are prone, and stunned.
Forge, you are hit by spikes, take 10 damage, and are stunned, but don't fall!
Lucian, you get clipped, for 5 damage.