Kind thx for so many tips, I'll put them into use on my next swamp mission as while I'm beat I'm definitely not broken yet.
Just finished clearing last of the 3 crypts present on closest patch of swamp, sailed iron back home will forge it tomorrow. Should be enough for at least a weapon and shield, which once I discover another swamp with more crypts, hopefully will let me take care of body piles much faster. Preferably before they spam me with elites again or it's gonna be hard test for the iron buckler.
I wonder how/will that also change my chances with wraiths in particular. While I don't rly go out at night, staying home smelting or cooking instead, they got me more than once howering over the wall for supprise attack. Fight was very one sided, either my block or my shield were too weak and even what looked like a succesful parry caused me a massive damage and knocked me off balance.