Talk:Ereshkigal/@comment-33844581-20180508101256/@comment-35516507-20180510210707

In terms of functionality, a Max HP+ is essentially an overheal benefit when you are at max HP. In many practical cases, you won't really survive an enemy NP from this alone even with the defense buff, but (used early) this skill can prevent any damage taken (e.g. lucky berserker enemy crit on your servants before getting to boss wave) to have as much impact on a servant's health pool.

Assume a servant like Leonidas has his taunt active at full hp. Give him the Max HP+ buff and he has 3k HP (assuming skill level 10) extra that he can lose, as well as a defense buff and NP gain+ buff to boot. Well if he takes any damage following the buff, Max HP+ alone will be superior because it preemptively mitigated the damage done by the enemy, and that's not even considering that he gains extra NP gauge from every hit (as well as has defense+ modifier to lower damage sustained to begin with).

Now assume the situation goes in reverse, he takes the damage and then you use the skill. Yes, he heals for up to 3k because the Max HP+ "heals" you for the equivalent amount to the health increase. However, he didn't receive NP gain+ for those hits sustained, and he will have most likely taken more damage than when he had the buff before everything attacked due to lack of defense buff in this scenario.

Overall, preemptive damage prevention > retroactive mitigation in most scenarios; an evade/invincibility or even a defense/damage taken down buff prior to damage will usually be superior to heals after damage. Even Guts is better because Guts can be used to survive an NP nuke (Irisiviel is a very powerful welfare servant in this regard, party-wide guts + heal is no joke)