considering just having an aura of battle item(2hp/sec) on a caster, or even a melee class you can notice the difference in regen from that mere amount. I would gather to say a zheart is a huge difference esp for casters. On red we had some wizards that would use them after pvp they would put epic barrier back up, then swap zheart to regen the hp they took through rune. mind you swapping epic alone is going to hurt when you put it back on youll be down like 150-200 mana minimum, offhand as well. but as long as you have an extra minute to regen mana before you swap back its not an issue. Zheart is one of those 'nice to have, but do i have the cash to waste on it' items. if your in a raiding guild and all the necros have one, send a tell on it to get one imo.
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