Iron Fist and Enchant Shield

Iron Fist and Enchant Shield are 2 level 900 buffs recently introduced.

Iron Fist is in the Offense Skill Tree, Enchant Shield is in the Defense Skill Tree.
But both skills really enchants an item you wear, and for the matter hunting, those items will be damage items, and in a way, both are offensive skills, regardless of where game makers place them.

Iron Fist description :
+0.1% per point stat bonus increase to your equipped gloves. (Excludes 'Gain' bonuses).
Require level 900, 25 stamina, and last 60 mins.
Offense Skill Tree

Enchant Shield description :
+0.1% per point stat bonus increase to your equipped shield. (Excludes 'Gain' bonuses).
Require level 900, 25 stamina, and last 60 mins.
Defense Skill Tree

Compare them with :

Enchant Weapon description :
+0.1% per point stat bonus increase to your equipped weapon. (Excludes 'Gain' bonuses).
Require level 25, 10 stamina, and last 90 mins.
Offense Skill Tree

Enchant Armor description :
+0.1% per point stat bonus increase to your equipped armor. (Excludes 'Gain' bonuses).
Require level 75, 10 stamina, and last 90 mins.
Defense Skill Tree

So the new skills require a higher level, more stamina, and last for a shorter duration.

For hunting (at level 820), the benefits are listed as follows ::
#1 : Enchant Weapon
(Reborn Elemental Blade of Fire) - 1740 damage
Level 1500 potion gives 2610 damage.
Level 1000 potion gives 1740 damage.
Level 175 buff gives 304 damage.

#2 : Berserk
It'll depend on your base damage, based on my stats :
Level 350 potion gives 1149 damage.
Level 175 buff gives 574 damage.

#3 : Fury
It'll depend on your base damage, based on my stats :
Level 175 buff gives 287 damage.

#4 : Enchant Armor
(Armor of Jutindou) - 1108 damage
Level 200 potion gives 221 damage.
Level 175 buff gives 193 damage.

#5 : Enchant Shield
(Shield of Caldoura) - 1170 damage
Level 175 buff gives 204 damage.

#6 : Iron Fist
(Volkers Gauntlets) - 740 damage
Level 175 buff gives 129 damage.
(Yes, this is not the highest damage glove, but this is probably what you will be using.)

That's the order of things, and getting enchant shield is less important than getting the lower level enchant armor, and iron fist is probably the least important among the damage enchancing buffs.