Without any major boost, I don't see myself using this spell as often as I would. Im not looking for any damage as close to FA, but something decent. This spell also requires you to add so much int and str, which isn't worth it in my opinion. sinX is a very squishy class and we can't afford to be putting int, unless the spell is worth the damage, which its not. I don't even think its a good idea to give them range to begin with since they already have 2 other options, that can dish out massive spike damage. Leave the range to snipers. This is coming from someone who's been playing sinx for years and use and tried every build. Without any major boost, I don't see this spell being useful.
Suggestion for loki dagger:
6% more damage to medium size monster and get rid of the meteor and soul breaker bonus.
I didn't suggest a change for loki blade, because its the only weapon that can be equip with daggers to achieve double damage, which is already good. This class obviouly don't need a boost, but for costing $30, it better give something useful..