Struggle of Chaos is a Japanese Booster Pack in the Yu-Gi-Oh! Official Card Game.
In other languages, this set is amalgamated with Mythological Age to create Legacy of Darkness.
Struggle of Chaos contains many Dragon, Fiend and Warrior-Type monsters and support. It also contains an Ultimate Rare reprint of "Summoned Skull".
Highly sought after cards include "Dark Ruler Ha Des", "Exiled Force", "Dark Balter the Terrible", "Ryu Senshi", "Fiend Skull Dragon" and "Reinforcement of the Army".
Yami Yugi's appearance on the cover of this booster pack is taken from the title page for Yu-Gi-Oh! Duelist Duel 148: "One-Turn Kill". This was also later used for Duelist Legacy Volume.5 and Ancient Sanctuary.
Each pack contains 5 cards and each box contains 30 packs.
The set contains 51 cards or 54 in the Master Set. This is comprised of: