Crimson Wood

Found it to be around 1 in 8, main problem is just the bad spawn rate. When I'm training @ Lower Ascent I kill the 4 trees every time they spawn, and only get 2-3 Wood per level.

I've noticed that Bandits/CBs/Shadowers have a noticeable advantage here - if they have a high enough level steal skill, and use a weak weapon, they have a good chance of getting the crimson wood from each tree (or at least getting mesos). If they get mesos, they can kill the tree for another chance (twice the farming rate).