The agility limit of Xia Lin is 24 points, but Shrink Spell will reduce its strength and is generally not used.
13 (agility base) + 4 (Freely Transform) + 4 (Enhancement Bonus, from potion or Cat's Grace) + 2 (Size Bonus, from Shrink Spell) + 1 (gift from Orpis) = 24 points.
So Dexterity Modifier is 7
Due to Enchantment Stone, he can wear leather armor while retaining Monk's expertise.
So the current limit ac is 49
10 base + 7 Dexterity Modifier + 3 perception adjustment value (from Monk talent) + 2 Natural Armor (from tree skin tree or necklace) + 2 Deflection (from Pious Shield or ring) + 5 (from leather armor Armor Bonus) + 4 (from From Shield Spell's Shield Bonus)+4(Defensive Attack)+1(dodge)+1(White Crane Spreads Its Wings)+5(defense and attack)+2(Shrink Spell)+1(Haste)+1(Bone Fist Spell)+1(luck)