Stop

Stop (ストップ, Sutoppu) is the 's standard special move in Super Smash Flash 2. The Black Mage stops opponents from moving. The longer this move is charged, the longer the opponent is kept in hitstun. When you start charging there are no numbers, but the more you charge it the more roman numerals appear, counting up to six. Once fully charged Black Mage will automatically use the move. This move is very useful for edgeguarding since it can stop opponents in the air, allowing Black Mage to attack them freely.

As of demo v0.8, he can now freeze any projectile with Stop.

Origin
In the Final Fantasy series, Stop is one of the spells used in battles. The effect of the spell depends on the game in which it appears, in the firsts games, this movement serves to paralyze the enemy for a certain time, in others used to slow enemies to avoid being hit. In Final Fantasy I,II and IV (was absent in Final Fantasy III) is a black magic spell, and since Final Fantasy V, it passed to be a time magic spell(called Time Materia in Final Fantasy VII).