*Tested on Minecraft 1.17 & 1.18. for 1.18 users, simply change the pack format from 7 to 8 in the given resourcepack*
The Pirate Pack comes with 3 mobs & 2 bosses. The mobs and bosses from this pack are all pirate-themed creatures with various behaviors and skills.
This pack contains:

• Pirate Swordsman (Mob): 5 animations
• Pirate Gunner (Mob): 4 animations
• Barrel Bomb (Mob): 3 animations
• Captain Octo (Boss): 8 animations + 1 modeled & animated skill. Comes with 2 melee attacks, 1 projectile attack, and 2 skills
• Lobster King (Boss): 11 animations. Comes with 2 melee attacks and 3 skills
• Pirate Cutlass Model (Item)
• Pirate Pistol Model (Item)
• 16 custom sound effects

OR you can get the boss packs separately:
The Captain Octo Pack contains:

• Captain Octo (Boss): 8 animations + 1 modeled & animated skill. Comes with 2 melee attacks, 1 projectile attack, and 2 skills
• 6 custom sound effects

The Lobster King Pack contains:

• Lobster King (Boss): 11 animations. Comes with 2 melee attacks and 3 skills
• 7 custom sound effects

Skills:
Pirate Swordsman:

• Sword Slash

Pirate Gunner:

• Pistol Shot

Barrel Bomb:

• Barrel Explosion

Captain Octo:

• Sword Slash
• Pistol Shot
• Speed Boost
• Tentacle Attack

Lobster King:

• Claw Bash
• Grab & Throw
• Abyssal Leap
• Lobster Heal

Dependencies: ModelEngine, MythicMobs
Tested on version 1.17.1, ModelEngine (r2.3.1), MythicMobs (4.14.1)
Also tested on version 1.18.2, ModelEngine (r2.5.0), MythicMobs (5.0.2)