Advice on Skill Enchanting

Hi all. I am leveling a Aeore Eva's Saint (pve focused). I have some questions around skill enchanting on the following skills.
.
Dark Backfire:
Hex vs Mind: Decrease P.Def or M.Def. I see most groups melee oriented so I think P.Def decrease would be more helpful
Chance: Haven't run into problems yet (97) with landing it. Worst case I'll cast it a 2nd or a 3rd time. Does it get harder in higher levels?

Mass Mana Gain:
Shield vs Magic Shield: What would make more sense for high-level PvE (I think more threatening are raid bosses magic skills) so M.Def would make more sense, right?

Thanks in advance

for pve I would enchant Dark backfire on chance as already crippling + mark of lumi debuff all the p def/m def needed.

on mana gain you can use wind walk if you want cap speed, else p. def always.

Is there a cap on the p.def / m.def reduction?

thanks!

Is there a cap on the p.def / m.def reduction?

thanks!

https://l2wiki.com/Mass_Mana_Gain_-_Aeore_Evas_Saint

The skill enchanted up to 10, which is usually more common in the healers, decreases -4.6%, whatever the option of P.def or M.def you choose.

Is there a cap on the p.def / m.def reduction?

thanks!

Yes, the maximum p.def reduction you can do to a player/mob is 50% no matter how many debuffs they have (e.g. a -50% p.def debuff and -50%, -30% and -20% p.def debuffs all stacked together will both just give 50% deduction).

For Dark Backfire I go Chance, it has a long re-use and is an important debuff in PvP, good in PvE. You want it to land first time.

Enchanting any Aeore skill for p.def reduction is a waste. Enchant them for chance or even m.def (oly).

Also don't enchant Lumi with power, do it by chance. I always laugh when other healers says they will do Lumi because they have it +10 power. As if the +5 dot damage is worth it.

Enchanting any Aeore skill for p.def reduction is a waste. Enchant them for chance or even m.def (oly).

Also don't enchant Lumi with power, do it by chance. I always laugh when other healers says they will do Lumi because they have it +10 power. As if the +5 dot damage is worth it.

I do it for power, but I dont care much about PvE Lumi debuff, and I just do it to prevent ppl from yelling at me and, in return, I be turn down on them.

Believe me or not, it's pointless to OE Lumi for chance, specially when that skill has a funny reuse of 2-3 seconds max, aka spammable. For Oly, tho, those OE for power could give a little hand in fights where you rely to win by dmg (ie. vs isses, tanks).