Moonveil Help

So, I just bought elden ring 3 days ago and I just kind of explored (I am playing almost entirely blind). I found the Gaels Tunnel or something like that and beat the Magma lizard Boss inside. He gave me the Moonveil Katana and I kinda want to use it. Now I wanted to know if it is worth investing the runes into INT so I can use it properly. And if I should go for a DEX/INT build if I wanna use this Katana