The Victory Park is a big place. Its main pathway is lined with small booths selling a variety of souvenirs and foodstuffs (at least in summer). It contains several khachkars (cross-stones) and statues, including the impressive mother armenia statue that has the museum of war as its pedestal (I'm not sure if they are opening the museum anymore though). In the vicinity there's a forever burning torch in honor of fallen martyrs. The Park also contains the small Areni lake at the back side of the statue.
In front of the statue there's a black cast-iron fence for watching the maginificent view over Yerevan and Mount Ararat. And it is here that you will find the cache.
The cache is a black MAGNETIC Nano.
This cache is the fouth in a series of 4, and ends here with your victory in reaching the victory park and witnessing the awesome mother armenia statue and the great view from the top.
Remember to bring your own pen, and look out for other caches in the bottom cascade area.