Dungeons-why Only Low Level?

We all know about the dungeons, the skeleton, spider, animal, zombie and silverfish. Then there's the snow, water and slime minidungeons (We won't count those since they give useless rewards and are slower that actual mob grinding) but why no high level ones? There needs to be some way of using dungeons to grind for level 50 plus, since the silverfish dungeon at that level is pretty useless.
I have a few possible suggestions for new dungeons for level 40 plus
Golem dungeon
Reccomended level=45
Metal beings populate this abandoned mine, perhaps created originally as mining machines.
rewards:20 falling emeralds, random level 40-45 weaponry and armour. Enough experience to get a level 40 up 4 sections of their XP bar. Is somewhere near Rymek since nobody actually goes there :(
There is a combat section first, a long parkour section with checkpoints inbetween and a small puzzle involving trying to find the right painting to throw an emerald behind while killing mobs.
All mobs deal fire damage, are defended against it and are weak to water damage
Mobs:

Bronze golem (Level 43)
Actual mob: Skeleton
Sounds: Blaze noises. When taking damage it makes a blaze's damage noise. Death is an iron golem's death
Wears full orange-brown leather armour except the hat and an iron ore block as a helmet
HP: 130
Damage:27-63 ranged. Shoots gold nuggets at players
Drops: Like normal mobs. Emeralds and sometimes items.

Iron Knight (Level 46)
Actual mob: Wither skeleton
Sounds: Iron golem walk noises. When taking damage it makes an anvil place noise. Death is a blaze's death.
Wears iron armour and a mob spawner as a helmet. Carries an iron sword as a weappon
HP:206
Damage:45-66 melee
Drops: Like normal mobs
Spell: Level 2 bash. Deals 150% it's normal damage

Ancient Guardian (Level 50)
BOSS
Actual mob: Iron Golem
Sounds: Iron golem noises but 2 times as slow.
HP:1005
Damage:100-109
Drops: Nothing
Spell: Charge. Does 150% of it's normal damage

Villager dungeon
Reccomended level:57
Rogue villagers rebelling against the laws of their kings hide out here, plotting a takeover.
Rewards: See previous but with level 55-60 weapons.
The dungeon is near llevigar inside the wall of a mountain.
The dungeon has a short parkour section, then a maze sextion for puzzle, and vinally an arena like area for combat before the boss.
All mobs deal earth damage, are defended against it but weak to air damage
Mobs:

Rogue Villager (Level 55)
Actual mob: Zombie with villager head and gold armour. Carries a diamond hoe as a weapon
Sounds: Villager noises but slightly slowed down
HP: 350
Damage:77-84 melee.
Drops: Regular mob drops

Decayed Mage (Level 59)
Actual mob: Zombie with a villager head and black leather armour. Carries the model for Bob's mythic wand.
Sounds: Villager noises, but slowed down about twice.
HP: 480
Damage: 90-99 ranged. Shoots emeralds at the player. Quite a slow shooter.
Spell: Charge. Deals 100% normal damage.
Drops: Normal mob drops

Greed master (Level 62)
BOSS
Actual mob: Wither skeleton with bright red leather armour and a villager head. Carries an emerald block as a weapon
Sounds: Wither noises. When taking damage is a wither taking damage. Death is a slowed down skeleton's death.
HP:10000
Regen: 300 every 10 seconds
Damage: 160-199
Spell: Ice snake. Slows and damages for 50% of it's regular damage

Enderman dungeon
Reccomended level: 73
The last of the ancient race before humans live here, seeking to test the bravery of human heroes
The dungeon is in the dernel jungle, relatively close to the delnar manor.
Rewards: 3 falling emerald blocks, level 67-75 equipment, enough experience to take a level 70 up by 4 parts of the EXP bar.
The dungeon starts off with a puzzle similar to the one in the slime minidungeon. You need to use the buttons to push all the iron blocks up from behind the wall on pistons to open the door. It is relatively easy like the one in the jungle dungeon. Next is a parkour section with 2 options. The shorter one with more mobs or the longer, more parkour based one. After that is a puzzle where you must get emeralds on all 4 marked preassure plates in the area, and finally a combat area before the boss
All mobs deal thunder damage, are defended against it and are weak to earth damage
Mobs:

Surviving Ancient (Level 70)
Actual mob: Enderman
Sounds: Enderman noises for all sounds
HP: 1400
Damage: 385-420
Drops: Ender pearl (Junk item) and normal mob drops

Ancient Bowman (Level 71)
Actual mob: Wither skeleton with chain armour and an enderman head. carries the crossbow model like the one from nesaak's weapon merchant
Sounds: Enderman noises sped up by about 10% for all sounds
HP:1355
Damage:200-345 ranged. Shoots reasonably quickly
Drops: Same as surviving ancient

Posessed remains (Level 67)
Actual mob: Obsidian block
Sounds: Ice breaking when taking damage, pigman taking damage when killed.
HP:990
Damage:205-344
Drops: No drops except emeralds and equipment

Ender Hero (Level 76)
BOSS
Actual mob: Wither skeleton with an enderman head and iron armour. Carries the thunder spear model like the one in troms' weapon merchant.
HP:29000
Regen:600 every 10 seconds
Damage:556-672
Spell: Throws ender pearl which applies slowness and 150% damage.
Drops: None

Golem dungeon key merchant spawns just ouside almuj in the savannah. Key costs 26 emeralds or can be gotten for free from mobs or doing the silverfish dungeon
Villager dungeon key merchant is inside Bucie at one of the golem guards. Key costs 26 emeralds or can be gotten for free from mobs or doing the golem dungeon
Enderman dungeon key merchant is inside troms near the armour merchant. Key costs 26 emeralds or can be gotten for free from mobs or doing the villager dungeon

All feedback is appreciated. Constructive criticism helps, but hate doesn't! I hope you enjoyed the ideas.

 

Although you put a lot of work into this, dungeons have to build, coded and planned.
it is hard to just "come up with some"

 

in the follow up update they will release more dungeons in Gavel, this has been confirmed and the dungeons are probably been worked on/done as we speak.

 

These were just ideas, possible suggestions on what dungeons might be possible. I know the must be built and coded, these were just ideas, which is why I was kind of brief with the explanations.

 

Dungeons are currently being implemented into Gavel and will appear in a followup update. I mean, what do you think Castle Dullahan is?