Chris_Nightwing
First Post
I like the flavor of the HP threshold, but it does create a weird situation where lower-HP characters are weaker against spells that don't necessarily have anything to do with CON.
For example, based on the HP progression for leveling on the playtest characters, the wizard won't hit 40 HP until level 13, while the fighter hits it at level 5. (And both of those characters have 14 CON, although Pelor knows what it's doing for the wizard given that he's only gaining 2 HP per level.) The fighter also (for some reason) has a higher Wisdom score than the wizard, so he even has a better shot at making the saving throw.
This is kind of the opposite of what I'd expect. Shouldn't a wizard be better against mental domination than a big dumb fighter? What does HP (whatever it represents) have to do with his ability to shake off mental spell effects?
From what I understand, spell DCs aren't tied to spell level in 5e, so even cast as a second-level spell, this will continue to be deadly against squishy units into the paragon levels. Without seeing higher-level characters, we can't really say that this is overpowered, but it seems like an odd trendline compared to, say, the direct-damage spells that clearly taper off in relative power pretty quickly. (Would a 12th-level wizard EVER prepare Arc Lightning when he could use the same spell slot for Hold Person?)
By the way, does "cannot move" in the spell description just mean you can't take move actions, but you can still cast spells, etc?
Using Level or Hit Dice as a threshold creates the can't-use-on-a-boss problem, and removes that tension of getting them when they are low on HP. Using HP will affect Wizards more easily than Fighters, yes, but then I can see defensive spells that effectively boost your HP for the purpose of spell effects (magic resistance could be expressed entirely as temporary hit points, for instance, putting you over thresholds and absorbing damage from fireballs etc).
Given that you get a saving throw (and should do in all cases) then it will really come down to your abilities, and, generally, Wizards have better mental saves than Fighters (though I admit there could be more incentive for them to have good Wisdom and Charisma).