Alistair

Q.E.D.
The effect of Q.E.D. is determined by the value produced by the modulo operation "(current turn) mod 4". In other words, divide the current turn by 4 and use the remainder. This means the value produced will always be 1, 2, 3, or 0.

Effects become stronger as more turns elapse, capping at 17+ turns (or 5 loops). All results affect all allies and buffs last for 3 turns.

Debate

 * Damage is 100%-500% of the sum of all four allies' current HP.
 * The last digit of the current HP sum determines the power.
 * 0 deals the least damage.
 * 5 and values near it deals greater damage.
 * 7 always deals 77777 plain damage.

Trivia

 * Q.E.D. is an initialism of the Latin phrase quod erat demonstrandum, meaning "which is what had to be shown". The phrase is traditionally placed in its abbreviated form at the end of a mathematical proof or philosophical argument when the original proposition has been exactly restated as the conclusion of the demonstration. The abbreviation thus signals the completion of the proof. -Wikipedia