Astral Tournament is a turn-based magic duel game where your mage confronts the other mages to win the tournament. The aim of every duel is to kill the opposite mage (reduce his hit points below zero) by summoning creatures to fight on your side or using direct damage spells.
All creatures and spells pertain to the following magical elements: Air, Fire, Water, Earth and Death. You start a duel with 20 power points distributed among all elements by random. And you have random sets of spells in each element.
The number of available power points affects spell casting, e.g. if your fire power equals 5 you can cast level 5 (or less) fire spells. When you cast a spell of level X, the corresponding element power reduces by X, but every turn all your magic powers increase by 1.
You cast a spell (for example, summoning one) and then your creatures attack. Turn is over. Your enemy cast a spell (for example, chain lighting) and then his creatures attack you. And so on.