Depends on the field spell. Inherently, Armityle has no effect that says he is immune to the effect of field spell cards.
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I would say Armityle, as 10000 easily beats 4000 for Obelisk. but still, that only does 6000 damage, but the other cards are dependant on the player, so there is no way of knowing for sure.
Zorc is the strongest duel monster next to Horakhty. So to answer Zorc is stronger.
The highest I know of is 5000 with 5 Headed Dragon and one of my favorite cards Dragon Master Knight along with 5000 Armityle the Chaos Phantom has 10,000 ATK during your turn only.
Magician of Black Chaos is a Ritual Monster that appeared in episode 38 of the Duel Monsters anime series. It is a Lv8 Spellcaster/Ritual Monster, DARK attribute, 2800/2600 with no effect, and is summoned by Ritual of Black Chaos. It should not be confused with the Dark Magician of Chaos from Invasion of Chaos, which while it looks identical, is an Effect Monster. Magician of Black Chaos did eventually get a TCG print in Premium Pack 1.
No, just like it's fusion materials ("Uria, Lord of Searing Flames" + "Hamon, Lord of Striking Thunder" + "Raviel, Lord of Phantasms") it's both tournament legal and unlimited (up to 3 in your fusion/extra deck)