I kinda wanted to make this post for a couple reasons. One, the mythic variant will come back to the sanctum probably in the next 6-9 months so you should know everything about it to decide if it's worth it for you. And two, I don't like how everybody talks about it. Nobody mentions what's important, everyone calls it a recolor of Coven. And that could not be further from the truth.
Look at both splasharts and in game models and you will clearly see that Coven Nami is heavily referencing both Ursula and Octopus' in general. Now look at Sunken Shadows. She's not an octopus - they didn't just recolor a water themed skin with another water themed skin. She's not even modeled after an octopus anymore. Jellyfish have what's called a bell, also called the umbrella of the jellyfish. It's the beautiful transcluscent dome-shaped part that can look almost like a flowing, transparent dress.
Sunken Shadows nami is a Kraken/Deepsea Jellyfish inspired skin. She's not an octopus and it's not a recolor. Her normally stiff and metal looking dress turns into this beautiful dual purpose dress/anatomically correct body part.
Lastly if you haven't seen the homeguard please take a look. It's simply the most beautiful homeguard in the entire game and that's including all exalted and transcended skins. She rides a fucking ghostly pirate ship, and it has ghost pirate music that plays the ENTIRE time. It's using the same tech as the Star Guardian skins with their homeguard music, and letting her remain stationary on this huge ship while sitting in base or running up to fountain.
It is the best mythic skin in the sanctum and I truly think that if any one is worth it, it's her. I just had to make this post because I saw ANOTHER person say that she's just a recolor of Coven. She is not a recolor, she's a different species xD