Phantom From Hell

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Currently, there is a rumor tell that if you put "PH4NT0M" in your seed, a bloody, devil look phantom will appear in your world. So, why not? I'm gonna give it a try. :) 
I'm spawned in the middle of the desert. Weirdly, there are no any sign of cactus, dead bushes and any animals spawn in the desert and etc. Well, I'm ignore these things and start to walking, thinking I can see anything useful. After walk over 120 blocks, I found a weird structure similar to Desert Pyramid, just its made of soul sands, soul soils, several golden blocks and nether bricks. I'm feel curious, then I'm going to enter it.