Depends on the field spell. Inherently, Armityle has no effect that says he is immune to the effect of field spell cards.
A Field Spell Card is destroyed when another Field Spell Card is activated or via an effect, such as Dust Tornado. If you activate a Field Spell Card while there is another already active on the field, your Field Spell Card will destroy and replace the existing one.
It is part of your 'playing field', but when something refers to 'cards on the field' it only refers to cards in the monster zones, Spell/Trap zones, and the Field Spell Card zone.
You are only allowed 11 cards as a maximum on a field, you have five monster card slots, five spell/trap slots, and a Field Spell Card slot.
I would recommend 20 Spell and Trap Cards, and 20 monster cards, or if not, you can have any amount of Spell Cards, as long as there are 40 or under, because 40 cards are the number of an official deck
yes they are and there tottaly weird
Yes, there can only be one active at any one time. If you already have a Field Spell active, you can replace it with another, the first is destroyed when you activate the second. If the opponent has one, then it is destroyed when you Field Spell card resolves. Field Spell cards can be set while another is active. Since the rule only affects active Field Spells, set cards are not destroyed by your opponent setting or activating a Field Spell card.
Molten Destruction
Giant trunade. It is a spell or a magic that will return all spell and trap cards or all the magic or trap cards on the field
The Graveyard is part of the Playing Field. When a card states "...on the field...", it is referring to cards that are placed in the Monster Card Zone, the Field Spell Card Zone, and the Spell & Trap Card Zone.
A Normal Spell card is one that has no symbol after the words '[Spell Card]' under the card title. The symbols after it denote Quickplays, Field Spell, Equip Spell, Ritual Spell and Continuous Spell, but only cards lacking these symbols are considered to be Normal Spell cards.
Yes, both Mystical Space Typhoon and De-Spell can destroy a Field Spell card in Yu-Gi-Oh. When you activate these cards and target a Field Spell, you can destroy that Field Spell card.