Quoting kenata, reply 33
I am not sure why some people are unhappy with removing essence in general. It was a fairly arbitrary limitation on the power of the sovereign, and was a fairly OP stat as far as pre 1.1 is concerned. I mean why would anyone want to put points into anything else. Since none of us have actually played the new version, nor seen exactly how global mana works, I think it is safe to say that any outrage over the removal of essence is probably veiled outrage over the devs ignoring some small community conversation about how these players saw the future of the stat.
It is more the fact that it will not matter who casts a spell, the only diffrence between one hero and the next (when it comes to spell) will be what spell they will have access to.
Note that some spells will have scale with the caster's intelligence. Based on how things are now, I'd imagine that this "some" actually means "every single one where that could possibly be the case".
Quoting Cruxador, reply 34
How does imbuing work now?
Imbues are to have a mana upkeep.
oh, okay. That's a very elegant solution.
Unless there is a stat that effects the ability to use magic other than the one that unlocks spells, then once that is high enough to use the biggest spell then caster heroes will be investing in non-magic stats (likely DEX and CON) and will never, ever need or want to become better at magic again.
Yes... until you research a more powerful spell. If the game can reach a point where that doesn't happen, then that's a problem, but it's not a problem with this particular system. And we've seen no indication that that problem exists. If you decide, "okay, this champion can use this powerful spell, that's good enough" and then invest in other attributes, then that's a decision you're making, and it should be valid, but it doesn't detract from the ability to not do that.
Also note that the fact that Intelligence buffs many spells is also relevant here.