Ice comet's not a great spell. It does more DPS than Rend but is less mana-efficient, which most of the time is what you really care about. Supernova, the other research spell at that level, is also huge DPS for a PBAE nuke (which you'll care about if you have any sense =p) but is terrible mana efficiency; you're better off with Thunderclap.
The two spells have some use but are by no means vital so don't worry too much if you screw up the combine.
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