Eikthyr is a 9-volt reindeer. Not tough, especially since you have troll armor. Kill it, get the antler. Hell, summon it and kill it again to get another antler and make 2 picks.

Within the black forest are copper nodes. Around the edges of the forest are small tin nodes. 2 coppers = 1 tin. Reason i mention 2 antlers is because the antler pickax is very rittle.