keterys
First Post
It's not as if that is an issue really though
Haven't seen dazed people having to sustain powers, or people unable to move because they needed to sustain and do something else? Also, many creatures can trivially make the move action to escape Bigby's against a wizard's Fort, fwiw.
That said, there is probably some big difference in viability of the spell depending on whether you allow someone to use a standard to attack with the spell when it has no one grabbed then in the same round sustain minor to deal damage.
But, if you assume a creature can escape often, say 60% of the time, and a wizard can hit 50% of the time, that makes the spell's expected damage more like
Round 1: 50% it misses, 50% it hits and does ~17 damage
Round 2: 20% chance that it hit and the creature did not escape for ~12.5, then 50% chance it hits the target or another target for ~17. If it's holding onto the only eligible target already, then you use an at-will which does about 1d8 less damage negating the advantage of the sustain extra damage compared to its attack extra damage, which means all further rounds are the same 20% and 50%, for our purposes.
So 8.5 plus (N-1)*(12.5/5+8.5)=8.5+11(N-1), where N is # of rounds... or 11N-2.5, for best ease.
Ie,
1 = 8.5
2 = 19.5
3 = 30.5
4 = 41.5
5 = 52.5
etc
Fireball following the same process is +1.5 per target (50% hit), half on miss (so 25% more), in one go, or 18.5X*.75, where X is number of targets.
Ie
1 = 13.875
2 = 27.75
3 = 41.625
4 = 55.5
5 = 69.375
Except, that's in an N=1 situation. So, sub in the at-will you're doing while that is happening. If you magic missile, that's an additional 6.5(N-1) you're adding (Avg 13, 50% hit), so in a 5 round combat where fireball hits 3 targets you're doing about 25% more damage than Icy Grasp. Even assuming you don't have encounter powers to use instead of at-wills that might be quite a bit more effective than magic missile.
Of course, Icy Grasp also _grabs_, but it does take a minor action every round and is just a better power than Fireball. Fireball is just not as bad as you think it is, or your requirements for daily powers are set by the select few that are shoulders above the rest. At which point, I have a vast list of powers that your fix does not address, at all.
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