My novel is called The Elementals. Here I will put the description:
Fire, Earth, Water, Air, and ? make up this powerful team. In world of humans that can develop elemental powers, something dark grows nearer and nearer. Heroes need to be found, and quick. From the limited amount of choices, destiny throws together 5 people with extraordinary skills. In this thrilling world, there is rule amongst the elementals. Each elemental has 3 matches. All together they make Fire, Earth, Water, and Air. When these 4 come together, their powers heighten to a remarkable level. And with a surprise 5th one? They may be unstoppable. With the threat rising rapidly, only a 4 match can destroy what's sure to come. At the last minute, another powerful elemental is pushed into action, his powers unknown. Will they win the battle? Will the other elementals have to train for war as backup? Who will win? Who will survive?
But most importantly, is everything as it seems?
This uses basic concepts from ClearyHackeling's My Pen Pal.
Trigger warning.