There seems to be a bug with the will training by Sharven, the stats that is actually modified by this is the intelligence stat.
How does this proceed :
You train will and in the skill window you actually see the skill \"Will\" going up but once you come to the point where you jump a level the stat that is affected in the stats window is the \"intelligence\" one and not the \"will\" one.
In the skill window it will however seem as if the will had gone up until the time you quit planeshift and re-enter where that particular skill will have gone back to it\'s initial value.
Note : while this is a bug it brings with it a cheat potential as the \"will\" skill has a cost of 15 PPs to level up and the intelligence one a cost of 16 PPs to level up. Of course this has no impact on CB as is since stats do not affect any characteristics except for strength that is used to measure your ability to carry certain weapons
