Obsidian is made when water touches the lava "sources", so it can be really easy to get a lot of it, and as far as weapons go i went through all of the Normal Mode with magic staffs, so i was a mage, but as far as melee weapons go, maybe a Phaseblade (for when you find the meteor), a Light's Bane (so killing the eye would be good if you wanted that) or the Bee Keeper, which drops from the new queen bee boss, which is found in a hive in the underground jungle in case you didn't already know. but personally out of those 3 weapons i prefer the Phaseblade. Also, you need at least a Nightmare Pickaxe to mine obsidian, just in case you didn't already know xD
i never seen a staff drop yet, i did hve oen amy gave me before i lost my charictor.
yea only have a gold pick ax atm, trying to fidn some neat accsors so i can fight eater of worlds to get the scales i need to build the nightmare pick ax. but i am aculty able to mine obsidan with a gold pick ax ^_^
just for giggles i dug my way down to hell. took forever was in an snow biom forever, then i finaly hit the lava level, and that was a huge pain. fianly hit hell.
got very lucky that i dug my way rigth above one of the super cool looking towers. reasion i consider that lucky is becuse not only do i get obbsidian now. but the mobs in hell are nightmarish to me. a single demoan was a battle for me, fire imp was a pain. the hellbats zerg me. difnlty not praired to walk around down there.
found some hell stone, giggled as i cought fire XD. luckly didint die. but at lest now i knwo were it is and were toi go.
also found a goblin tinker woot woot! so now i can combine the super cool rocket boots i have with the cool hermes boots and save a asscory slot. also walled off the goblin tinker so he dosint die form the swarm of mobs who wanted him dead.
also found a neat ice boomerrang. still got my bone sword. o also got a grapaling hook fianly. and flippers and the iron claws for sliding down stuff ^_^, team agy mvoign foword! ^_^