I wouldn't worry too much about giving your players the chance to do something awesome and clever when they're up against a wall. It makes for good times.

Now, if you're planning to make hiding or transporting objects a major challenge in your game, don't let them have a bag of holding. But if you aren't, I don't think it will be a problem. A bag of holding won't let your players outshine each other or waltz through tough challenges.

I have a question about the human forms of some of these Denarians.

How did you decide on skills for the ones we've never seen in human form? Most of them look reasonably optimized, and it gives the more physical Denarians some versatility that I'm not sure they deserve.

PS: I totally agree with you about the Our World's overestimation of the Denarians. They're placed at plot device level, when everything we've seen in the books indicates that a Senior Council member could swat them like flies. (Except for Nick, of course).

Some suggestions for the chimera:

• Give it a Many-Headed aspect
• Make poison or lead the catch to its toughness. After all, Bellephoron killed it with a lump of lead at the end of a spear.
• Give it 3 boxes of social stress capacity, since it has average presence.

Now that that's over and done with, here's my take on the unicorn.


Unicorn
High Concept: Living Symbol of Natural Purity
Other Aspects: Elusive, Beautiful

Skills:
Superb (+5): Athletics, Survival
Great (+4): Alertness, Fists
Good (+3): Presence, Endurance, Might
Fair (+2): Stealth, Rapport, Empathy
Average (+1): Conviction, Discipline, Investigation

Stunts:
Vanish Into The Woods (Survival): A unicorn may use survival instead of stealth for hiding and skulking while in an unpolluted natural forest environment.

Powers:
Inhuman Strength [-2]
Supernatural Speed [-4]
Echoes of the Beast [-1]: +1 Alertness in an unpolluted natural forest environment, leave no footprints, talk to other unicorns
Claws [-1]
Neutralize Poison [-1]: Renders all poison within several meters harmless.
Entrancing Beauty [-4]: All who look upon a unicorn must roll their Discipline against the unicorn’s Presence. Failure means that the character gets the “Entranced” aspect. Entranced characters cannot attack the unicorn. Furthermore, the unicorn gets +2 to all social skills against entranced characters. Entranced characters may reroll their discipline each exchange in order to resist.

Stress:
Mental OOO
Physical OOOO
Social OOOO

Total Refresh Cost: -14

Notes: A unicorn normally lives in the Nevernever. It can only be lured out into the real world by a virgin girl. A unicorn dies if its horn is removed. This horn provides the Neutralize Poison power to the user at no refresh cost.

PS: I’m really not sure about the cost for Entrancing Beauty.

Not to toot my own horn, but I posted a power very similar to this to the custom powers thread. Combine it with an item of power discount and you're good to go. Assuming, of course, that I did my job correctly. I don't think it should be unbalancing, unless the player is actively trying to break the game. And if a player is actively trying to break the game, then you have worse problems than overly-exploitable powers.

Very nice stats you have here. You're quite the public benefactor, Deadmanwalking. Still, I have a bit of (hopefully constructive) criticism.

1. The rules for alertness and athletics are designed for humans. Animals have a completely different balance of senses and athletic abilities. While the sensory part of this is partly represented by the Echoes Of The Beast power that all animals have, I don't feel that it goes far enough. It only gives a +1 bonus to alertness, which doesn't come close to covering the difference between the sense of smell of a human and that of a shark or dog. I would fix this with stunts, if I were you. Same goes for athletics: the animals with the Awkward On Land aspect don't have anything backing it up. Once again, you can fix this with stunts.

2. It's often not clear what benefits an animal gets from Echoes Of The Beast. It would be most helpful if you could list what you have in mind for each.

3. It's not entirely clear what the catches on the toughness abilities of the animals are. In fact, I'm not even sure whether they have catches. Should we just assume that the catch is always vulnerable points on the body of the animal?

Don't take all this as a sign that I think you did a bad job. On the contrary, this is great stuff. But you can always improve, right?