As I see it, there are two bugs with Storm Cubic.
The first is pretty obvious... its called Sonic Blaster ingame! Ive submitted this as a bug report to NC, and still no love. This is a NCNA problem, so if they could fix it, Im sure all the TKs and Warlocks will be thankful.
The second bug with it is its crystal price. Its "wrong" (as I see it anyways).... if you look at the other summoners, there are two types of cubics as far as cost go. Theres two types of cubics.. what I will call for the purposes of this post "Full Cost Cubics" and "Half Cost Cubics". At lvl8-9 (lvl72-74 for the character), full cost cubics cost around 13-14 D crystals. At the same level, half cost cubics cost around 7 D crystals.
Cubics are as follows:
Storm Cubic: Full cost (lvl8 = 14 D crystals) - TK and Warlock Skill
Binding Cubic: Full cost (lvl9 = 13 D crystals) - Warlock Skill
Healing Cubic: Full cost (lvl7 = 13 D crystals) - TK and ES skill
Aqua Cubic: Half cost (lvl9 = 7 D crystals) - ES skill
Phantom Cubic: Half Cost (lvl8 = 7 D crystals) - SK and PS skill
Spark Cubic: Full Cost (lvl9 = 13 D crystals) - PS skill
Viper Cubic: Half Cost (lvl6 = 6 D crystals) - SK skill
Vampiric Cubic: Full Cost (lvl7 = 13 D crystals) - SK skill
For Mass Cubics:
Mass Summon Storm Cubic: Full Cost (lvl8 = 52 D crystals) - Warlock Skill
Mass Summon Aqua Cubic: Half Cost (lvl9 = 28 D crystals) - ES skill
Mass Summon Phantom Cubic: Half Cost (lvl8 = 28 D crystals) - PS skill
This is according to the L2 skills section. All of those above skills are the highest level you can learn them.
As you can see:
SKs = 2 half, 1 full
ESs = 1 half, 1 full, 1 half mass
PS = 1 half, 1 full, 1 half mass
TKs = 2 full
Warlocks = 2 full, 1 full mass.
As you can see, TKs and Warlocks get kinda shafted on the cubic costs. They're the only ones who pay so much to summon two cubics. Storm cubic really isnt that good that I would call it better than aqua cubic or phantom cubic. Sure those cubics have to land to do anything, but when they do land, they are much more useful than a little bit more damage (storm nuke = SS crit for me without crit damage buffs).
So please.. NC... half the crystal rate for Summon Storm Cubic, and Mass Summon Storm Cubic so that Warlocks and TKs have the same crystal costs when summoning. And please change the name so it actually says "Summon Storm Cubic"!!!!