I really really like the idea of a Gnome character who suddenly transforms into a massive brute of a "monster" and starts laying into opponents with a giant weapon and as such I really would like to make a Goliath Druid character but seeing as how I've only ever played a Druid once, and the character didn't last very long, I would love some advice on how best to pull this character off.
I essentially see the concept almost like playing the character like the stereotypical Barbarian type of role, but with spellcasting as an added benefit, and could even consider taking a couple levels of Barbarian to add a little extra flavor to the character.
Our starting level currently is 5th, with attributes scores of 18, 16, 14, 14, 12, 12, before racial adjustments are made and placed wherever we see fit. I'd love any advice on how best to go about making a Goliath Druid and which form(s) to focus one, and whether it would be better to go with a natural weapon based character or utilize the giant's forms to wield a two handed weapon. What feats would be best to go with, and what kind of items/feats I should be focusing one getting.
...isn't this a spriggan?
Not that there isn't anything wrong with that. It is a fine monster, with a decent gimmick.
Anyway, for mechanics, I will refer to the section on transmutation:
When you cast a polymorph spell that changes you into a creature of the animal, dragon, elemental, magical beast, plant, or vermin type, all of your gear melds into your body. Items that provide constant bonuses and do not need to be activated continue to function while melded in this way (with the exception of armor and shield bonuses, which cease to function). Items that require activation cannot be used while you maintain that form. While in such a form, you cannot cast any spells that require material components (unless you have the Eschew Materials or Natural Spell feat), and can only cast spells with somatic or verbal components if the form you choose has the capability to make such movements or speak, such as a dragon. Other polymorph spells might be subject to this restriction as well, if they change you into a form that is unlike your original form (subject to GM discretion). If your new form does not cause your equipment to meld into your form, the equipment resizes to match your new size.
Giants are a type of humanoid, and as such they have all the parts for normal spellcasting. Also, unlike most druids, you can get any equipment you want since it doesn't meld but instead scales with you.
For build you want to focus on-
You want to use weapons, since few giants are decked out with more than bite/claw/claw. The fun thing about giants as well is their reach- even the simple large forms means you threaten a circle 30' wide (40' with 5' steps on both sides). That means you can full attack a fairly wide area, and you also threaten a wide area for AoOs (meaning you are hard to run past). So a nice 2 handed weapon is your best bet, since they give nice weighty hits that really take advantage of your boosted strength.
While things like bastard sword seem appealing, they require investment of feats since you lack martial proficiency. But you do have a great choice by default- the scimitar. A +1 impact scimitar hits like a great sword (when you are large) and it has 18-20/x2. So it will do fine.
Until level 12, the actual giant you choose hardly matters much (unless you want natural attacks). It is mostly cosmetic. After level 12, you want something with regeneration (since it means you can't be just killed). Grab the die hard feat, and you suddenly can keep fighting no matter what- you can go way past negative hp and keep on swinging. You could easily become the one thing to stand between the party and TPK.... unless someone gets fire or acid out.