It saves you a couple seconds between casts. It's not terribly important for necros. Since necros are more about cast efficiency than spamming spells quickly. it does have another very unique function related to the top spell gem. It immediately resets the spell you have there. So if you had a spell that had recast time, you could click it and it would immediately refresh the spell. However, you cannot truly recast the spell until the recast time is elapsed but you can START casting the spell before the recast time. A few classes gain a lot from this little quirk, while others will never use it.
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