Methinks more detail is needed but here is my response for certain situations. (With crawlers)
In the open: A good solid club could easily get me clear while i Run a smack here a thwack there and i should be fine.
In a Building: Once again a Club should get me clear i mean i'm not making much noise ao getting out is that much easyer just find an unswarmed window i can get through without injuring or killing myself when i jump through it.
In the Open: a weapon that is a certified one hit kill that i can recover with quickly... Fire Axe? or maby shield and hatchet.
In a building: Hatchet and shield "Once more unto the breach dear freinds! once more!"
Your sword would have to have a razor edge that would shatter immediately upon impact with bone. It would also have to weigh about 200 pounds and be swung by a machine very quickly, cutting through at whatever the weakest point would be. KATANAS AREN'T CLAYMORES! CLAYMORES AREN'T SUPERSWORDS! No sword could possibly cut through 5 bodies, it just isn't physically possible. And all of you who say, "kAt4Naz R b AMaZinNnGfUL!!!1!!one1!!!" are idiots. They can't do one eighth of all the things you say. Take an ACTUAL katana, and go at a ballistics gel dummy with it. THEN you can say what katanas can and can't do. And you need to remember, YOU NEED TO SHARPEN IT! You can say it has the sharpest edge ever, but first of all, you don't want a razor edge, since it ruins the blade, but you can barely keep a razor edge on a small hunting knife, forget about carrying a whetstone to sharpen your "kAt4Na."
In that case I'd use a USAS-12 converted to belt- or box-feed and set to semi-automatic. The belt would feed into the gun from a large backpack-cache. Standard 12-gauge spread ammunition soaked in volatile octane--the explosion that propels the bullet would ignite it and send flaming buckshot everywhere. Potentially dangerous to myself, but I'd have a shitload of fun while they got blown to literal shreds. For added fun I'd attach a sharp set of spikes and blades to the USAS-12 and to my arms, then wade through the bloody mess wearing a fireman's suit.