Hey all,   I really do like Excalibur and ever since I acquired his proto-armor skin and pendragon helmet, I've really liked his look. For those of you who use him as their main warframe, what are some of your end-game builds (and how much forma have you invested in him)? I love using melee for the most part, and I tend to pair him with a nikana prime. I'd love to hear how you guys build around that (or any other melee weapons that you enjoy).   Thanks!