for the tc :

you can also get skoll and hati and the carapace spear this way. the rest of the stuff is hardgated by eitr tough and eitr is hardgated by black metal which boils down again to MUST KILL MODOR no matter what.

a seeker solider can break the iron armors and the trees for you. this allows you to skip the swamp biome entirely. getting black marble is actually pretty easy. just wait for an attack on a dvergr tower thats fully manned with dwarfs. youll get marble without fighting yourself if there is fire mage around the tower.

the cape is sadly fully off limits without moder.

there is already a video about this on youtube.

you dont need to be in iron age. you could get this before even fighting the first boss.
but these 4 items is all you can make. the spear is the best spear in the game tough.