Base Set is the 1st booster pack in the Duel Masters TCG.

It is the first set to contain 120 cards.

In the TCG, there are 5 artworks for this booster pack. These artworks consist of

Aqua Sniper
Deathliger, Lion of Chaos
Mighty Shouter
Rothus, the Traveler
Urth, Purifying Elemental

This set introduced the following keywords;

Blocker (Whenever an opponent’s creature attacks, you may tap this creature to stop the attack. Then the 2 creatures battle.)

Double breaker (This creature breaks 2 shields.)

Power Attacker +N (While attacking, this creature gets +N power.)

Shield trigger (When this spell is put into your hand from your shield zone, you may cast it immediately for no cost.)

Slayer (Whenever this creature battles, destroy the other creature after the battle.)