I'm currently in 3* gear, about to start crafting all of my 4* gear when my Mist energy fills back up. In in Bombing Gear, and I primarily use the Freezing line. I've heard that the Calibur line of Sword is good in combination with the Shivermist, but I currently am using the Sealed Sword, because I got it with Jelly Tokens.
Assuming I'm going to primarily be in group play (soloing doesn't seem that great to me), should I craft the Calibur Sword from the beginning up to a 4*, or should I stick with the Sealed Sword? I'm F2P, so I most likely will only ever use two weapon slots.
Calibur is a great line with freeze bombing. Freeze holds enemies in their place letting you charge and hit enemies with all three strikes. Add that on top of no weaknesses and you've got a great combo.
I don't use equip slots, and I've run Leviathan with Shivermist many times in T3. Works amazingly for pretty much everything.