A neverending field

[Corwin]

Consulting her mental map, Seira leads the way to the tower on the streets of Dis.

[Corwin]

I'm wearing the hiding amulet, to be explicit (but it's hidden behind my clothes).

[Anastasia]

Gimme a d100. Also so we have it in thread for reference, paste the amulet's description here?

[Corwin]

20:15 <Corwin> roll 1d100 Kobot
20:15 <Kobot> Corwin rolled 1d100 Kobot --> [ 1d100=23 ]{23}

Here's the relevant aspects:

An amulet that will protect the wearer an those close to him protection from the passive scans of the Iron Tower's sensory magics.
The radius is indeed 30ft.
An iron amulet that hangs heavy on the neck.  It has no particular shape, close to being a simple lump of iron, but it should work.
The amulet does not radiate magic that you can see at all. The amulet would allow her to enter Dis like that, but not another divine realm. The passive scans are the various scans and defenses of the Iron Tower.

[Anastasia]

It is a trip past devils. Bands of them that work hard, lesser devils laboring away. Buildings are torn down and constructed with efficiency, labor and toil before you. You pass a large building being torn down, dozens of barbazu lead by a cornugon taskmaster.

As you pass Xera looks on with a faint frown, while Amaryl merely glances and turns away.

[Corwin]

Yes. The utter anger that being confronted with an infinity of evil is difficult to control. It's not even helpelessness, because Seira could choose to give every devil here a final death. Rather, that wouldn't change anything on the planar scale. No, to do that, they need to rescue Yemimah and offer her a chance to decide her own fate for the first time in her life.

[Anastasia]

The crack of whips. Devils. Slaves. Minions. All toil in Dispater's city, where the flames burn bright and tall. Yet you endure and know that matters may well be worse, that a battle here wins you nothing.

It still hurts.

A bank.

Gaggar's bank is a stately building of stone and steel, doors open wide to admit any who care to enter. A pleasant smell comes from within - molten gold, Seira's draconic experiences tell her. It's very classical, as much a temple as a bank. Beautiful erinyes can be glimpsed within, each with a ready smile as if to beckon business to come forth.

[Corwin]

Seira gets in line to one of the tellers, following her instructions for now.

Also, I wanted to clear up a few things re: the Tower. Details within the spoiler.

Spoiler: ShowHide

Firstly!

The Iron Tower

Dispater's legendary redoubt is beyond the scope of this stat block to describe. It deserves its own article, as it is a fortress as well as the culmination of Dispater's defenses. Nonetheless, a few salient points are described here.

It is known that Dispater can use his iron grasp and rust abilities as a ranged touch attack against any creature or object within the Iron Tower. There is no limit on the range of this, only that Dispater must be able to see them. Scrying and divine means of perception are sufficient to qualify. Likewise, Dispater can use his counter-spelling abilities against any spell he can perceive being cast within the Iron Tower.

Dispater's writeup says he can tell whenever anyone casts a spell within the tower. Does my amulet protect from that detection? Since it works against passive stuff and I imagine absolute detection is passive, I'd think it is, while the countering is the active defense, but I'd prefer to be clear on that one. Asmodeus did agree to provide me proper details for the amulet, so I feel I should know.

Iron Grasp (Su)

Dispater can touch creatures and instantly turn them into iron. This is a melee touch attack, functions as flesh to stone (except that it turns them into iron) and can only be cured by a wish or miracle spell that succeeds on a DC 78 caster level check or a deity that succeeds on an opposed rank check against Dispater. The Fortitude save DC is 78 (10 + 1/2 hit dice + Charisma modifier + divine rank).

Secondly, what negates Iron Grasp? From writeup, it doesn't appear to be polymorph subschool. It refers to Flesh to Stone, which is also not polymorph on the SRD. Would Stone Body immune it due to the bolded part of the spell's write up?

You are immune to blindness, extra damage from critical hits, ability score damage, deafness, disease, drowning, poison, stunning, and all spells or attacks that affect your physiology or respiration, because you have no physiology or respiration while this spell is in effect.

Or does it draw from the flavor of Flesh to Stone, and requires you to have a fleshy body, thus transforming to an air elemental or a plant or whichever protects you from it?

My knowledge check would be 120 for any relevant discipline.

Finally, a Rust question.

Rust (Su)

Metal objects that touch or are touched by Dispater crumble into useless rust, ruined beyond all repair. Any metal weapon that strikes Dispater or is touched by him by a melee touch attack must make a DC 72 Reflex save. Failure results in the weapon crumbling to rust and is destroyed while success protects the weapon. A weapon that saves against this ability is immune to it for 24 hours. A creature made of iron, such as an iron golem, takes 20d6 points of damage from this ability on a failed save.

Objects destroyed by this ability are lost. A wish or miracle that succeeds on a DC 72 (10 + 1/2 hit dice + Charisma modifier + divine rank) caster level check can restore the equipment, as can a deity that succeeds on an opposed divine rank check against Dispater. Only one check per deity is allowed per item.

Dispater can suppress or active this ability as a free action at any time.

How does it work on held objects? The Iron Tower allows him to use it as a touch on anything in the Tower, but does it still mean if he targets my swords in its sheath, I am the one saving with my saves against it?

[Anastasia]

To the first, yes, you would be protected from notice unless he's directly observing you (which would not be a passive defense).

To the second I'm not going to comment on Dispater's stat block, as you simply don't have the knowledge to deal with that or a reason to ask IC.

I won't comment on the third, beyond to note that if you have an item it would count as an attended item and receive your saving throw, as normal.

Soon enough you stand before a teller, a male erinyes who flashes you a charming smile. "How can I help you today?"

[Corwin]

"I would like to speak to Gaggar," Seira tells the erinyes, and while hidden from view by Amaryl and the others pulls on the chain to allow the teller to catch a glimpse of the amulet.

[Anastasia]

The teller immediately nods, "Of course, please come this way."

[Corwin]

Seira gestures for him to lead, ready to follow.

[Anastasia]

As you go, you notice a pair of invisible cornugons emerge from the side walls, a ripple of magic you can glimpse turning them momentarily passable. They follow your group, albeit at a respectful distance.

[Corwin]

Seira doesn't pay them any overt attention. Either their information is good or it isn't. For now, they'll continue as planned.

[Anastasia]

You're taken back to an office. An office decorated in gold, one with a large window to view the hellscape beyond. Sitting in a large, plush red chair is a devil - a rather fat one, working away on paperwork. He is the size of a human with brownish scales across his body. Spectacles adorn his face as he works, a look up, "Excuse me?" he asks coolly.

"Your special guests," the erinyes bows and steps away.

Instantly that look becomes a smile, "My special guests!" he declares once the erinyes is gone and the door is closed. "Come in, come in."