I made myself a Calibur, managed to upgrade it directly to Tempered Calibur, and wow, this sword rocks ! Not really because of the damage (though it's good), but because if you charge the attack, it will blast away every enemy close to you on 360°, and as a bonus they take double damage if they collide against a wall. Thats 200 damage total on most of them, its really great because of the aoe damage and the crowd control (they fly really far away, i think they even damage other monsters if they collide, at least i know for sure that they break blocks).
This sword got me past the manor and several floors deep into tier 2, but i'm still not able to clear tier 2 on my own. I think i was stopped hard at floor 14 or something, by some mecha knights with frost rays. Also as you may have noticed, the damage dealt by monsters is directly related to the floor number, and my puny 2 stars cobalt suit only protects so much. And i need to level my gear up with heat to be completely efficient.
I also built the sword "spur", it's pretty good because faster than regular swords, but i didnt get much use of it as it was too low level to be useful when i got it (this one shoots a short range beam disk when charged). And i crafted a wrench wand, probably one of the only items that looks mage-ish (it shoots a long range/low damage beam thing when charged), and i got lucky on the craft roll, as it has a small bonus damage on beasts (added to the natural high bonus damage on constructs). Still, it seems that i won't get much use of my swords other than Calibur, because i still only have 2 weapon slots and the gun is just too useful to shoot explosive blocks from afar. I guess i'll have to upgrade spur to use it, i think either the first or second upgrade have beams added to normal sword swings. But thats far away, i don't have the materials and money yet, and i need to focus on armor.