In theory, you can even skip the antler pickaxe by luring a troll to copper and tin deposits and have him smash them to pieces, then collect the ore. While this works, it'll take a long time to get the required amount of ore to build a bronze pickaxe, so if you're not in for a challenge, just get a lvl 2 leather armor, build a shield, a spear and a crude bow, then kill Eikthyr. You can find the boss altar by using the reddish waystone in the stone circle where you arrived in the tenth world.