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Each class can only equip a certain armor class. Affiliation with each armor type is like this:

Name	Class	Level	Slots	Abilities	P-ATK	M-ATK	P-DEF	M-DEF	Fire	Water	Earth	Wind	Light	Dark	Rarity
Sub Gear	Robe	1	1	N/A	0	0	+1	+1	0	0	0	0	0	0	1
Sub Robe	Robe	10	1	N/A	0	0	+2	+4	0	0	0	0	0	0	1
Sub Gown	Robe	20	1	N/A	0	0	+3	+7	0	0	0	0	0	0	2
Sub Attire	Robe	28	1	N/A	0	0	+4	+10	0	0	0	0	0	0	2
Sub Yin Yang	Robe	36	2	N/A	0	0	+5	+12	0	0	0	0	0	0	3
Sub Garment	Robe	42	2	N/A	0	0	+6	+14	0	0	0	0	0	0	4
Wild Robe	Robe	47	2	Max HP +10% Max MP +10%	0	0	+7	+15	+3	+3	+3	+3	+3	+3	5
Loose Sash	Light Armor	1	1	N/A	0	0	+1	+1	0	0	0	0	0	0	1
Loose Guard	Light Armor	10	1	N/A	0	0	+3	+3	0	0	0	0	0	0	1
Loose Kimono	Light Armor	20	1	N/A	0	0	+5	+4	0	0	0	0	0	0	2
Loose Vest	Light Armor	28	1	N/A	0	0	+7	+6	0	0	0	0	0	0	2
Loose Plate	Light Armor	36	2	N/A	0	0	+9	+8	0	0	0	0	0	0	3
Loose Sheath	Light Armor	42	2	N/A	0	0	+10	+9	0	0	0	0	0	0	4
Rough Armor	Heavy Armor	1	1	N/A	0	0	+2	0	0	0	0	0	0	0	1
Rough Shell	Heavy Armor	10	1	N/A	0	0	+4	+1	0	0	0	0	0	0	1
Steam Plate	Heavy Armor	15	2	Anti-Fire Anti-Water	0	0	+3	0	0	0	0	0	0	0	5
Rough Mail	Heavy Armor	20	1	N/A	0	0	+8	+2	0	0	0	0	0	0	2
Rough Defense	Heavy Armor	27	1	N/A	0	0	+10	+3	0	0	0	0	0	0	2
Rough Jiongjia	Heavy Armor	35	2	N/A	0	0	+12	+4	0	0	0	0	0	0	2
Steam Armor	Heavy Armor	35	2	Anti-Fire Anti-Water	0	0	+8	+2	0	0	0	0	0	0	5
Rough Metal	Heavy Armor	42	2	N/A	0	0	+14	+5	0	0	0	0	0	0	3
Rough Alloy	Heavy Armor	47	2	N/A	0	0	+16	+6	0	0	0	0	0	0	4
Black Armor	Heavy Armor	48	2	SP Eater SP Eater	+3	+3	+21	+13	0	0	0	0	-5	+5	5
Steam Suit	Heavy Armor	50	2	Anti-Fire Anti-Water	0	0	+12	+4	0	0	0	0	0	0	5