Just a few things I feel like I should point out. Artifacts are basically non-consumable items (e.g. weapons, rings, shields, armor, etc...) that are highly enhanced magically in some way or another. Once a mortal or deity decides on a type of artifact they wish to create, they can then collect resources, or in the case of deities just conjure them up unless they're extremely rare, though a mortal can also conjure up more simple resources as well. From there they pour in magical energy, either from their own power, the environment around them, or both. You still need some experience creating an artifact though, and thus a mortal that specializes in thunder magic would have a lot of trouble creating a water dagger unless they actually had some specialization in water magic as well. Deities can bypass this rule through the use of divine magic, and they can even just charge an item with "raw" divine magic instead if they want. This would effectively give the wielder control over any field in magic until it runs out of mana. Divine artifacts need to be recharged by a god once they run out of energy though, so most artifacts are based off of arcane magic instead.

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Regarding your character [@Klomster]

[b]Notes:[/b] Even if you focus heavily on the creation of artifacts, you still have more than enough divine magic to easily create a fire tornado or an arcane thunder storm. 

[b]Appearance:[/b] Regarding his size, He should at max (in base form) be around 12 - 15 feet tall. Growing any size larger than that should be reserved for other occasions. You're still allowed to keep yourself always at the larger height if you'd like. Just keep in mind if you become severely injured you will be reduced to your normal size. (I probably should have specified this though)

[b]Skills:[/b] Your character is not the greatest at creating artifacts. He only excels at it (by quite a lot) compared to other characters around his level.

[b]Preferred Field of Magic:[/b] Please limit yourself to 1 - 5 fields of magic.

[b]Fighting Style:[/b] Please elaborate. How does he use his sword? Does he fight with misdirection? Does he swing wildly? Does he fight in a skillful manner? Does he have any strengths in combat? (e.g. bypassing his opponents defenses, fighting against multiple foes, etc...) What weaknesses does he have in combat? Is he clumsy? (for a deity) Does he tend to leave himself open when he has the upper hand? Does he have trouble hitting faster opponents? etc...

[b]Artifacts:[/b] Your hammer should not be the first hammer in all of existence. (Just reread it as "told to be the first hammer" so please ignore this unless you wanted it to actually be the first hammer)

[b]Pocket Dimensions and Home:[/b] Is there anything outside of the foundry? Or is it literally just the foundry by itself? (Keep in mind your portal dimension should not be more than a couple miles wide)

[b]Biography:[/b] "A biography detailing the growth and popularity of your character as a deity, as well as how the followers view their deity. Are any of their views regarding your deity incorrect?" You left this as the first sentence. :P

You should not have been born on the first strike of a hammer against an anvil. This should be a misconception as your character would not have lived at this point in time.

Also what species of mortal tends to worship you? (I accidentally forgot to add this in, so it's not your fault)

[b]Contradictions:[/b] You were born when the first hammer struck an anvil, but you also have the first hammer in all of existence. In your religions lore, does this mean you stole the first hammer in existence from some guy after he hit it on an anvil?