For what it is worth: you can farm Large Titanite Shards relatively quick from the leeches in the swamp of Blighttown. There are like 20 of them in total and they can easily be one-shotted. Make sure you have the Rusted Iron Ring for max run speed in the swamp and you could kindle the bonfire there for 10 estus flasks if you haven't done so already. With that much estus on hand you don't even need to bother with purple moss to heal the poison. I would ignore the mosquitoes as well since you can just outrun them. From bonfire > leeches > back to bonfire only takes a few minutes and I tend to get at least 1 - 2 Large Titanite Shards on average per run.Im playing DS1 and Sen's fortress is a ridiculous jump in difficulty D: i feel like im doing little damage with my Halberd +8 , problem is i always think its pretty difficult to switch weapons in these games because you need to 'invest shards and souls, and with how rare large titanite shards are im not sure if its a good idea to change plus i like the long range halberd has.its annoying because you do get some interesting weapons in your playthrough.
Any tips? Or should i play other non story areas instead
Also note that any active humanity, up to 10, raises the chance enemies drop items. So it might be worth consuming some humanities if you want to speed up the process. (Note that your form — hallowed or human — doesn't matter; the humanity just has to be visible on the counter next to your health and stamina bar).