Stoneskin prevents all damage.... so a permanent stoneskin ogre would be indestructible.
Also, lets see.. untouchable water walking caster standing on an inland lake shooting water elementals, fireballs, whatever else every turn isn't good?
That impression about stoneskin stems from a bad documentation in the pedia but its not the case.
All stoneskin does is what the mouseover says (which is +2 defensive Strength, 3 First strikes (which is the 3 attacks dealing no damage mentioned

) for sure to represent the thick hide + i belive some minor resist to certain kinds of damage as well in the dimension of 20% each. And thats it. Perhaps the resist-part has even been axed with the last change.
But it should be good. Tier 2 Spells are usually. With it going away after combat it is weak. Even weaker than Water 2.
And im sure Earth-Sphere as a whole whould still be. Even if Stoneskin whould be made permanent (on mages/other arcane casters at least. For other things) and its Elemental handed Geruillia 1 + 2 but more on par overall not least due to its passive Effect which then might be enough to make the sphere interesting enough.
Still very neat on a 13/17 Unit (with stoneskin). Those things are huge chunks of muscle wielding a big stick with a nail in it and it should be hard to take one down. Some decrease of the stats to compensate for Stoneskin beeing permanent whould be in order naturally. At least a reduction in defense strength of 2 points since stoneskin grants that. Which whould be a nerf for the first combat, but a major improvement for the rest of the ogres/dragons life.)
Compared to other Tier 2 Spells Water Walking is. (but only in comparison to those.)
Dosn't mean its outright bad or useles. And i sure didn't say the water sphere is a bad one. (quite on the contrary if you read my other comments in this thread

). Tier 2 spell is its "weak-spot" to balance the strength of the rest. Which is fine and should be that way imo. (It was a problem before the change to water-elementals. Now with the better elementals its a decent sphere. Also the change to the elementals has in itself helped alot in making Water 2 more viable without other spheres.)
Now some players might argue that you cant take a weak Tier 2 spell to balance a good Tier 1 and 3 spell but that as we know is how ffh2 is designed. So it seems one can.
(on macro-level not feature level. And whole spheres quite obviously balance in comparison to whole other spheres. With huge varition between spheres within each tier.).
If someone doesn't likes that kind design-guidline a modmod is the most likely way to go for those...
@ Zup:
I don't really get it.
Tell me a single reason why stoneskin beeing permanent on casters (which means mages + archmages + liches + mage/archmage heroes + dwarven druids if i remember rightly) with earth 2 whould be a real problem (ganovan can't teach earth so non-arcane casters/non-auto-starters can't get it.)?
(and it becoming a solid to strong spell is not a sufficient argument to woe me. Anything bar blatant overpoweredness in comparison to other Tier 2 like fireball / maelstorm / charm person and the likes.
Earth is far from the strongest sphere. And imo the difference whould only be rather minor for the casters, but important for other things around.)
Remember: Not only whould it be a coding mess to separate but it whould help players + AI to just make it permanent (the big baddies at least. Dragons should be thougher. A call long voiced on the forums. On Stoneskin Ogres i agree that some kind of lowering of their stats might be appropriate but still those things should be though...) and make the code lighter as well (one call less, less casts and thus less micro + AI processing) + it very much makes sense from a flavor perspective, doesn't it?
In fact i belive the restriction is only in place because it had to be for the old! power of the spell (thats a long time ago. I belive it was changed sometime even before the mod was changed to bts and another time thereafter. Could even have been an old Tier 3 Earth-Priest spell before the first overhaul of spells. But my rememberence of that is somewhat blurred... Long time ago...) where it did affect a whole! stack each! time you cast it instead of just the caster (and was also Tier 3 because it whould have been far to powerful as Tier 2 for a whole stack.)
All good reasons for! a change in my book.
Unessesary unflavorful pseudo-meta-balance for old times sake doesn't sound as good design worthy to keep to me.
Its very possible i err on the part of it not becoming to powerful naturally. Still some explanation why, whould help me to at least understand the reasoning, if anything.