Forum:Sacred Beast Question

I have a question about the fusion of the 3 Sacred Beasts: Armitael, Phantasm of Chaos. In the official card it says: Armitael, Phantasm of Chaos This card cannot be Special Summoned from your Extra Deck except by removing from play the above cards on your side of the field. (You do not use "Polymerization"). This card cannot be destroyed by battle. During your Main Phase 1, this card gains 10000 ATK until the End Phase.

Does that mean that after that End Phase it's attack drops to 0? Because that would be really lame... Anyways thanks!