[RPG] Is a simulacrum tangible while inside an antimagic zone

An existing forcecage spell's effect is probably unaffected by an incoming antimagic field spell's effect

A spell that creates multiple walls of force—like the the 4th-level Sor/Wiz spell force chest [evoc] (Spell Compendium 97) or the 7th-level Sor/Wiz spell forcecage [evoc] (PH 233)—requires using the rules for the 5th-level Sor/Wiz spell wall of force [evoc] (PH 298-9), and those include how the wall of force spell's effect interacts with the effect of the 6th-level Sor/Wiz spell antimagic field [abjur] (PH 200), this despite the antimagic field spell's description specifying only the spell wall of force.

The spell forcecage says

Like a wall of force spell, a forcecage resists dispel magic, but it is vulnerable to a disintegrate spell, and it can be destroyed by a sphere of annihilation or a rod of cancellation.

Compare that with the spell wall of force, which says that it's effect

is unaffected by most spells, including dispel magic. However, disintegrate immediately destroys it, as does a rod of cancellation, a sphere of annihilation, or a Mordenkainen’s disjunction spell.

The reader must refer to the spell wall of force to learn more about the spell forcecage (otherwise, for example, the phrase "vulnerable to a disintegrate spell" is meaningless). And, if trying to determine how, for example, the antimagic field spell's effect interacts with the force cage spell's effect, the reader'll end up back at the spell wall of force anyway.

It would take an extremely strict reading of the spell antimagic field—followed by a personal definition of what a forcecage spell's effect's now-mysterious walls of force were actually made of—to have an existing forcecage spell's effect suppressed by an antimagic field spell's effect.

Walls of force usually block line of effect but an antimagic field spell's effect does not

Normally, the antimagic field spell's effect just doesn't care about a magical effect that would block its line of effect: the antimagic field spell's effect causes the existing magical effect to be suppressed. But, like the spell antimagic field says—and the Rules Compendium confirms—, "A wall of force… isn’t affected by antimagic" (11).

Thus even an existing forcecage spell's barred cage effect allows spells to be cast while those within would be, if uncaged, in an antimagic field spell's effect, although usually not beyond the barred cage effect's walls. While an "otherwise solid barrier with a hole of at least 1 square foot through it does not block a spell’s line of effect" (PH 176), the forcecage spell's barred cage effect has only "half-inch wide [bars] with half-inch gaps between them."

However, casting the spell forcecage while within an existing antimagic field spell's effect and picking as the forcecage spell's effect's point of origin a crosshairs within the antimagic field spell's effect means the forcecage spell's effect is suppressed while the antimagic field spell's effect remains. (However, picking for the forcecage spell's effect's point of origin a crosshairs that's outside the antimagic field spell's effect seems to mean the forcecage spell's effect functions normally. The antimagic field spell's effect doesn't block line of effect (RC 11)—an apparent reversal of how the spell antimagic field functioned according to the Dungeons and Dragons, Third Edition FAQ—, but opinions on exactly how this works vary widely.)

Specific Beats General

PHB 7 states,

If a specific rule contradicts a general rule, the specific rule wins.

In this case, the Wish specifically states that the target is immune to the Antimagic Field, whereas the text of Antimagic Field is more general. Thus, the Wish wins out.

Note that I think the wish only applies to the creature(s) it's cast on, though. You'd probably have to word the Wish quite carefully to allow casters to cast spells on other creatures inside the field, for example. Additionally, I wonder if such a wish would make that creature vulnerable to magic when they otherwise wouldn't be...

Careful Wordings

Note that any usage of wish besides the ones listed in the text gives the GM latitude to mess up your wish, and a sufficiently crafty DM could probably poke holes in nearly any wording. Depending on your particular situation, you could word your wish in several ways:

• "I wish that any spell that I cast will not be suppressed by an antimagic field"
• "I wish that my magic items would still function in an antimagic field"
• "I wish for the ability to selectively un-suppress magical effects in an antimagic field"
• "I wish that any beneficial magical effect targeted on myself will not be suppressed by an antimagic field"
• "I wish that only spells cast by [hostile creature] are affected by this antimagic field"