Is it only good for normal logs or can you change any log, I.E. mahogeny?

Any log (that can normally be planked) works.

is it a single lo or a whole inventory?

single log only...at 30% less planking price.

 

 

 

so means its cheaper to plank normally, cept maybe for mahogany..maybe not tho...

When I first posted this question the KB was not updated for new spells, but now it is:

 

This spell converts one set of logs into a plank. The cost in coins depends on the type of logs (wood - 70; oak - 175; teak - 350; mahogany - 1050)

the other thing of note....it's very slow

 

 

 

Not really worth doing bulk loads IMHO, only good for the occasional plank