Buff rings ( part 1 )

Why are some rings useless. They need some buffs so let’s give some to them. Their crafting recipe should be more expensive than cheap ones because they give buffs to the character. Part 1: buffs

Air ring – 8 unobtainium ingots, 20 sapphires and 1 megalodon tooth.
Buff:
swimming speed: 2 -> 3
Oxygen: no changes
Max mana regen.: 0 -> 1

Dragon ring – 20 rubies, 60 iron ingots and 1 dragon heart
Buffs:
Max hp: +20% -> +30%
Max hp regen.: 0 -> 1
Hunger regen.: 0 -> +0.03

Mystic ring: 4 unobtainium ingots, 40 gold ingots and 1 aragog eye
Buffs:
Max mana: +30% -> +40%
Flying speed: 1 -> 2
Max mana regen.: 0 -> 1

Other changes: buying rings from the alchemists is more expensive.