User blog comment:Theslymumbasa/Cursed Flames or Crystal Storm?/@comment-4644196-20120104132042

While the Crystal Storm may do more DPS, the Cursed Flames spell can penetrate, meaning the Crystal Storm is effective against bosses like Skeletron Prime, while Cursed Flames is good against Destroyer (I know from experience - Cursed Flames does MASSIVE damage to Destroyer, as it penetrates).