Battle credit for heals?

[MsQi]

no matter the case, if you're a healer: Put your DoT on it!

[Asako]

Aye but what people are saying is in the larger hunts people on weaker machines might not see the enemy load. If you are unable to target the boss you can try tossing a heal on someone in your party to get the heal credit from them, try and hit a melee dps or tank with it as with their faster GCD's and auto attacks they are more likely to already be engaged with the target. Try aoe moves like Assize ect and place your healing bubbles if you have one over the target to clip any melee in your team.

If you have more time and you still can't target the boss, target another player and manually click the bosses name from their target thus allowing you to target it.

[SamSmoot]

You have to hit the enemy to get the kill, not heal

As WHM, I get credit if I cast Asylum (big bubble heal) on the group. If it's on CD, then I just hit the boss once.

[Hanayumi]

Have to hit the boss at least once to get credit, it was a change a long long while back. <TT> or an aoe in mid if group usually does the trick if youre have a hard time seeing the hunt, way you can tell is if it pops up in the enemy list.

[Iscah]

WHM's Assize spell is a quick easy way to successfully either hit the boss or heal someone who has hit it. Instant cast, single button press.

[Renathras]

I'm not sure if you HAVE to hit the boss, but I always do just to be safe.

If you have SMN leveled to 90, that means you have SCH, so I'd suggest running the train as SCH. At this point, you should have some way to get level 90 gear for it, and you don't exactly need advanced gear for Hunt trains. If you can target the boss, Biolysis or Ruin 2 it then spam Succor. If you can't target the boss, run into the middle of where all the players are and hit Art of War a few times. It's instant cast, centered on your position, and doesn't require an enemy to be targeted to hit them. Once you see the enemy on your little enemy list (the one with the red circle, orange triangle, or yellow square), then switch to Succor spam.

Honestly, that's what I do a lot of the time. Sometimes I WHM it (Holy also doesn't require a target and is spamable, but Assize very much does work nicely because it has just a massive range so it's super easy to hit the boss SOMEhow even if you can't see it), but SCH/SGE's Art of War/Dyskrasia are nice since they're instant for those cases where marks are vaporizing fast.

If you have a max level tank, same situation, just you use Shield Lob/Tomahawk/Unmend/Lightning Shot if you can see it (your AOE if you can't - like all healers other than AST, all tanks have AOEs that don't require a target) until you get it on your agro list. With tank stance, you get full credit REALLY fast just by spamming the ranged attack because it does something like 10x enmity or similar ridiculousness. PLD can also spam Clemency on people, just make sure you're on the agro table before you start doing so.

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Hope that helps.