Although people try to equate HP and "defense" (i.e. damage reduction) during tankbusters (using concepts such as eHP) to determine whether a tank survives a hit, the two stats aren't actually interchangeable.
HP and % damage reduction stats (def/mdef) influence the total amount of unhealed damage you can take. % damage reduction stats (def/mdef) and parry/block influence the rate of incoming damage. Outside of tankbusters, tanks and healers are primarily responding to the rate, not the total amount. (If the former is like "distance", the latter is like "velocity").
As an example, if the rate of incoming damage is less than regen + fairy, the healer has complete freedom to dps. As the rate of damage increases, more of those offensive spell casts have to be substituted with curative spells to match the rate, and the reverse is true if a tank or healer cooldown (i.e. rampart, divine seal) is used. Stats on gear that influence % damage reduction (i.e. the ilvl of your left side tank gear pieces) help with this as well.
Your ability to dps on a tank or healer comes from your knowledge of damage patterns and correctly matching the rate of incoming damage. Tanks do this primarily by adjusting the incoming damage through their stance and defensive cooldowns. Healers do this primarily by substituting heals and offensive spell casts, as well as by titrating up (divine seal) or down (cleric stance) the rate of outgoing healing. Healer DPS and healing are interwoven together.
Outside of tankbusters, HP becomes an important factor on a healer if you treat your tank's HP bar like a black mage does their MP bar, alternating between no outgoing healing at all to panicked, compensatory healing without outgoing dps. If a portion of the tank's HP bar stays unfilled for the entirety of the fight, it's as if it doesn't exist (you might as well not have it). HP matters in this case only because the tank's HP is intermittently being brought into a range where even autos are dangerous. Correctly matching the rate of incoming damage with outgoing tank cooldowns and heals resolves this problem.


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