Also what the point in a escape button if it always fails? Do us all a favor and next time you make a game don't put one in, there no point in it if you can't use it . And I figured out what was wrong I defeated the monster that drop the key and I used it in a different dungeon and the monster in that dungeon don't appear because of it. This is one of the worst game I ever played.
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The escape formula is the same as basic RPG Maker XP. It takes the agility of the player's party and divides it into the agility of the enemy troop, multiplies the result by 50 and then generates a random number between 1 and 100. Unless modified, this is how all RPG Maker XP games work. I actually made escaping easier by providing an item called the Scoot Fruit which bypasses the check entirely if you have one in your inventory at the cost of consuming it. I've just done a check now though and it's fully possible to escape from battles without scoot fruits. You may have been using a slow team against fast enemies.