Originally Posted by
zagan
20 should work it's powerfull but it fine the theme really well.
Also if your intend is to make it hard for them to be ressurect if kill in this state you need to change the wording to make it clear, such as.
"If the Stoneskinned is killed while under the effect of this ability he can only be ressurect using ...."
Also I forget to ask but does the DR still apply ?