Here are some enchantment ideas.
Armor Enchantments[]
Burning Thorns[]
When you are wearing armor enchanted with Burning Thorns,any mob or player that attacks you with meele or ranged attack will be set on fire.Burning Thorns has 3 levels.Burning Thorns I sets the target on fire for 9 seconds.Burning Thorns II sets the target on fire for 1 minute.Burning Thorns III sets the target on fire for 1 minute and 30 seconds.This enchantment is useful for fightning hydras.
Sword and Axe Enchantments[]
Dragon Slayer[]
This enchantment can be applied to both swords and axes.Any sword or axe enchanted with Dragon Slayer will deal more damage towards dragons(including the Ender Dragon).Dragon Slayer has several levels.Dragon Slayer I causes the sword/axe to deal 5 extra damage to dragons.Dragon Slayer II causes the sword/axe to deal 20 extra damage to dragons.Dragon Slayer III causes the sword/axe to deal 25 extra damage to dragons.Dragon Slayer V causes the sword/axe to deal 30 extra damage to dragons.Dragon Slayer IV causes the sword/axe to deal 35 extra damage to dragons.
Serpent Killing[]
This enchantment can be applied to both swords and axes.Any sword/axe enchanted with Serpent killing will deal extra damage to gorgons,hydras and sea serpents.Serpent Killing has 2 levels.Serpent Killing I causes the sword/axe to deal 10 extra damage to gorgons,hydras and sea serpents.Serpent Killing II causes the sword/axe to deal 20 extra damage to gorgons,hydras and sea serpents.
Demon and Undead Ruler Destroyer[]
This enchantment can be applied to both swords and axes.Any sword/axe enchanted with Demon and Undead Ruler Destroyer will deal extra damage to The Dread Queen and The Ifrit.This enchantment has 1 level.Demon and Undead Ruler Destroyer I will cause the sword/axe to deal 15 extra damage to The Dread Queen and The Ifrit.