The Blaze is a nether mob that spawns in fortresses. It has Normal health (20 hp) but a strong attack (6hp) and can set players on fire. It can drop up to 1 (more with looting) blaze rod. It can be hurt by water but can't burn. They will also take damage from snowballs. The Best way to kill them is to avoid the attack, because you can't hit it back at them like you can with Ghast fireballs.
Health Points: 20
Attack Power: 6
Ability: Burn [time=5sec][dmg: 1hp per 2.5 sec]
size: [width=0.5b] [height=1.8b]
The Enderman is a mob that spawns in the Overworld, End and Nether. It is actually the only mob to naturally spawn in all 3 dimensions. It has 40 hp (2x the amount of a player) and a strong attack of 7hp. This and shulkers are also the only teleporting mobs. They are also one of the tallest mobs, at 2.9 blocks tall. If a player attacks or looks at an enderman's head, the enderman will become hostile.
Health Points: 40
Attack Power: 7
Ability: Teleport
size: [width=0.6b] [height=2.9b]
The Elder Guardian is a mob that only spawns in Ocean Temples. It is the only mob to cause Mining Fatigue, an effect that decreases mining speed. It has 80 hp (4x the amount of a player) and a very strong laser attack (12hp) and a weaker melee attack (5hp). There are only 3 elder guardians in each ocean monument. Their mining fatigue makes it so that you can't mine through the ocean temple walls, therefore making it harder to enter.
Health Points: 80
Attack Power: 12 (laser) 5 (melee)
Ability: Inflict Mining Fatigue
size: [width=1.9975b] [height=1.9975b]
The Ender Dragon is a boss that spawns in the end. It has 200hp (10x player hp) and an attack of 10 hp, It has an attack called dragon's breath that does 3hp of Area damage per second. This boss is the final boss of Minecraft (mainly for speedruns). It can also heal from End Crystals, so make sure that you destroy all of those before attacking the dragon. The Best way to beat the dragon is to wait for it to come to the portal, where it can be hit easily instead of trying to shoot it while it's flying.
Health Points: 200
Attack Power: 10 (melee) 3 (DPS) (Breath)
Ability: Dragon breath
size: [width=16b] [height=8b] [length=16b]
The Wither is a boss mob that can only be spawned by the player. When it is first spawned, it will charge up for 10 seconds. Then it will create a Massive explosion that can deal up to 99hp of Damage (That's Half of the ender dragon's HP!). It has 300hp (15x player, 1.5x Ender Dragon). When defeated, It will drop a Nether Star, which is used for crafting Beacons.
Health Points: 300
Attack Power: 8 (ranged) 1hp per second (Effect)
Ability: Wither (poison, but can kill)
size: [width=3.5b] [height=0.9b]