Neither one of them has any skill in set traps (or at least none to speak of). The spikes are nearly infallible as far as I can tell, and evidently even with very high agility and relatively low armour I am stuck in place by spikes as surely as any heavily armoured warrior.
I will pass over the whole problem of honourable knights using tricky thief gear in combat (I'm sure that can be justified
Major problem: Infallibility - spikes ALWAYS work. I was amused to see that when I set them and was having trouble finding the command to retrieve them... Abharsair appeared in order to help me out.... and he was hurt by them! Have to admit that an item might be overly effective if it even works on immortal beings.
On a player level, it seems like characters with higher agility could jump over spikes or weave through them or something. If this is the case I have not seen it. One can run right through one's own spikes (that is if I set them myself), but it seems like I should have a chance at avoiding them if I know about them.
Here is my idea... spikes work just as they have, except make it a skill vs. agility contest. With a high set traps skill one knows exactly how to scatted the spikes to prevent someone's movement through them. He also knows how to scatter them to cover all the exits. The person who is in the room with the spikes, by the same token, must move through the field of spikes and must use agility to do so.
And by the way... spikes should definitely not be able to be dropped by a heavily armoured dwarf crusader while riding on the back of a galloping unicorn with perfect accuracy! I should at least get the chance to avoid it. I had less of a problem when Ezekeil did it, because he was at least on foot (all moral problems with clergymen using thief items aside)... but from horseback?
The truth is that Rex probably would have killed me with his gigantic lance and huge unicorn anyway (he got a solid crit early on)... but being able to also use thief gear with no skills for it in mid combat while mounted seemed a little overkill to me.
-Alamar