There is a certain official scenario where, on the back of the last card in the agenda deck, it just says "all investigators take 100 horror (cannot be cancelled or ignored)" as a means to eliminate everyone and end the scenario.

Imagine that Stella and Roland are doing this scenario and that Roland (who is In the Thick of It) has an Enchanted Armor in play when this last agenda card is flipped. Roland assigns all 100 horror to Enchanted Armor and then has to "Test Willpower (100), if failed, discard Enchanted Armor and reassign the 100 horror", but Stella commits Neither Rain Nor Snow to this test. What happens? Roland should survive, right? Does scenario just continue forever, without an agenda deck?

The limit of this card is that you can gradually move 1 doom each turn, so the incentive is to try to "eat" as many as possible in one go when you spend without agenda advancing first.

I am thinking of a combo with Seal of the Elder Sign for Amina Zidane (She should be able to take it?), which can move multiple doom to Sin-Eater. Controllable means you can plan to be greedier with cards that could endlessly fill itself with dooms like Blood Pact or David Renfield. effect is also not limit to the asset but any card at your location, so could be cool to team up with other investigators or enemy/location doom added by scenario.

Permanent is an asset, and asset is at the location according to the rule.

While an investigator is at a location, that investigator, each of his or her assets, and each card in that investigator's threat area is at the same location.

So playing a fairly fast and lean Ursula deck right now and I realized something that made it worth writing down, while its obvious fieldwork is good with Ursula, the non obvious thing Ursula can do is trigger field work or her ability in any order, so you can enter a location and investigate it and have field work be a bonus to the next test that you perform, instead of just boosting the investigate.

I didn't realize until today that means if you have two field works you can stagger their triggers, one before Ursula's investigate and one after, which lets you either investigate with a +2 twice (often better then a single +4) or even investigate and then get a bonus against a treachery or special effect.

For mystics, David Renfield provides bonus but many investigators avoid using him due to doom. Now, Elle helps to solve that problem. With Renfield + Elle, you can get +1 bonus as well as 1 free resource for each round; notice that you do not choose to add doom onto Renfield when triggering his ability.

However, some problems remain. We need Charisma, so that true xp cost of this combo is not 2xp but 5xp (or 7xp for 2 Elle in the deck). In addition, we give up the great ally, Arcane Initiate, or need additional 3xp. Finally, the overall cost of Renfield + Elle is 5 resource, which is high even if we could earn 1 resource per turn. Of course, it is good chance that we revisit David Renfield without any fear about placing a doom.

I write the above review before the least taboo was revealed and now that combo is 13xp. Now, that's too expansive combo IMO.

I've been messing around with modernizing my Agnes deck and I feel that this fits very well over the old Arcane Research. She has plenty of upgrades before she starts losing value with it, thus she can accelerate her deck into the 2nd and 3rd scenarios, but maintain the sanity, which for her is a very valuable commodity.