Traps "An ability to effectively use explosives and mines, and also install grenade-traps on doors (using the context menu)."
You can not go higher than 200%.
You can not lay more than 1 unit of any explosives in 1 hex. If you will try to lay another explosive in that hex, previous one will explode. The more % of this skill you have, the more damage (and less visibility) your trap does. With 200% Traps you will have about 20-25% bonus damage to your explosives. If a grenade will hit the hex where your trap is, there are: 10-15% chance for it to explode, ~20% chance that the detonator will break (it will just evaporate) and ~70-75% that the explosion won't do any damage. For mines. max. chance of an explosion is 30%. ~30% of a chance that mine will break and 40% that it will remain safe. If you will activate the detonator with the explosives while being outside of the location. A message of "you are too far away" will appear. Dynamite can not be set to more than 60 seconds, you can set more, but it will explode after 60 seconds anyway.
You will have 10%+(PE+AG) % of this skill while starting a character.