Life Points

A resource from the japanese playing card game Yu-Gi-Oh. They start at 800 and if they drop to zero you lose the duel.
Life Points can also be used for card costs and maintenance. Two card examples are Solemn Judgment (One-time payment of half of your current) and Imperial Order (700 LP per turn or the card is destroyed).
A few monsters' offensive and defensive stats are also dependant on LP. Two examples based on your own LP are Meklord Emperor Granel and the Dinomorphia monsters. One example taking the opponent's LP as attack is Endless Decay (when summoned, ATK = half of the opponent's LP).

Duelist A: I discard Ash Blossom & Joyous Spring to negate your Maxx "C".
Duelist B: Chain Link 2, I activate Solemn Judgment and pay the Life Point cost to negate your Ash Blossom.
Duelist A: Chain Link 3, I activate Seven Tools of the Bandit by paying 1000 Life Points to negate your Solemn Judgment.
Duelist B: Motherf... I don't have a response.