Is Deceleration spell useful?

[IanTheWizard]

If mob have 1actions and attacking once a 60second then with 2actions he will attack once to 30second, 4act=15sec, 8act=7.5s... If animation of attack is longer than this time, then slow/speed have no differences.
From other side if mob can attack once to one second with 15action (and animation not slowing this) then with 8action it will be 2second, 4act=4sec, 2act=8sec, 1act=16sec, slower is impossible.
melee you seen little differences because weapon have small actions and short animation
archer no difference because they have small actions and long animation
spellcaster have bigger difference because they need more actions and animation is starting after raising hand[right][snapback]43960[/snapback][/right]

Thanks for explaining.

So this spell is useless against melee and archer mobs.

As for spellcaster mobs, I think the spell is still not useful because slowing down their every spellcasting for only 1 second is not very helpful. It requires too high Astral Magic knowledge (> 100) for this spell to be good so it's not worthwhile.