Superpower School

In this world, everyone can use superpowers. Each family has different buffs or debuffs. For example, the most famous 'Lotz Acre' in this school is the Acre family, and the Acre family can use second-level abilities and only have abilities that combine two general abilities among rare abilities. Lotz Acre has the ability to combine electricity and speed, called Electro-Speedster, and Warp-Speedster, which combines teleportation and speed. Lotz uses these abilities separately, and to change them, he must press the Change Power button attached to his weapon.

Users, please choose from these families.
Dwayne Family: They only have abilities that can produce various abilities (e.g., nature, physics), and they can use all abilities related to those abilities.
Aston Family: They only have general abilities, but the power of those abilities is tripled.
Stein Family: They can use abilities that combine three general abilities. Instead, the power of the abilities decreases by 10%.

Terminology
General Ability: An ability that includes many abilities, but is not a combined ability, just one single ability.
Rare Ability: The probability of appearing is 4.8%. Rare abilities include combinations of various abilities, abilities that include various abilities, etc.
Possessed Weapon: You receive a weapon when your judgment improves to a certain extent. You choose a weapon that you want and can use efficiently. To eliminate the difference in power, there are no long-range weapons or weapons that kill opponents. Even if you lose it, your possessed weapon returns to your hand. (Lotz Acre's possessed weapon: A rod about the size between an unbreakable longsword and a dagger. It has a lightning bolt engraved on it.)
Power Coin: A coin used when participating in the duel tournament held once every three months.
Duel Tournament: The duel tournament is held once every three months, and you can participate by paying 1 Power Coin. At this time, if you duel, you can take 3 coins.
Duel Request: If you say this word and say the opponent's name, you will request a duel with the opponent. If you win, you take 2 Power Coins from the loser.
Duel Acceptance: A word to accept the opponent's duel request.
Duel Rejection: A word to reject the opponent's duel request.

The grades are from lowest to highest: F -> E -> D -> C -> B -> A -> S -> UR -> UR+.