Need some GMing suggestions - Temple of the pale horseman

[Kitora]

Hi guys,
So I have the pale horseman and his horse, Charon (or Death), imprisoned by 1 of the good gods in my campaign.
They imprisoned in a temple of sort, and guarded by an Empyrean angel plus other things left behind by the angels.

I know that I want an empyrean angel (BBGG) to guard for sure, but not sure what else should I put in there.
I don't want other angels, for story reason. The place is effected with negative energy leaking out from Charon himself, and give negative effects to Good creatures and boost Evil creatures.
What other creatures should I put in there either as guards or simply neutral creatures?

Thanks.

[doomman47]

Arcon lanturns lots of arcon lanturns possibly with class levels.

[Dave Justus]

Classic ancient temple guardians are constructs and undead. While it sounds like undead would do great there, in most campaigns good gods wouldn't be using them. Of course a negative energy leak might have drawn some in that weren't part of the original design.

Constructs are pretty obvious, and I'd certainly throw a few in. Maybe adding something special to a few either a corruption from negative energy (construct is haunted) or a higher planes add on (adding the celestial template to a construct would make it quite challenging)

There could be a cult still defending it (like the Medjai from the mummy movies.) If inaccessible normally, they could have some sort of alarm and teleport in.

Creatures/Champions of the good gods could be in stasis, only awakening when X happens (opening the seal to get into the second level etc.) This allows for all sorts of possibilities in a 'sealed off ancient dungeon.' Depending on how rich your world history is and how much your PCs are into it, could also lead to some interesting interactions as these people will have lived through what the characters regard as mythological history.

[Reduxist]

Since Charon works almost exclusively on the River Styx, you could work that into the temple somehow. The good gods could have gotten a hold on the Styx and drained Charon’s power through it. There could be some underwater secfions and aquatic creatures the players would have to face.

[Cevah]

Add a bunch of Graven Guardians.

Have lots of Ravenous Tumbleweeds blowing about.

Oozes should also be great.

Bound elementals should also fit in nicely.

Many gods have association with an animal. Classed animals could serve here easily.

Encountering some Caryatid Columns can cause havoc with the party.

An anti magic zone can also mess up a party. Constructs still work in the zone, but most spells won't.

Add a bunch of Terra Cotta Soldiers for mobs.

Set up a Forbiddance or three for obstacles.

Random Dimensional Locks will also play havoc.

For flavor, add assorted Haunting Mists, and perhaps sprinkle in a Mind Fog for more nastiness.

/cevah

[RainOfSteel]

Titans.

[Cevah]

But not Teen Titans

/cevah

[Yqatuba]

Wait are you saying the PCs are trying to FREE Charon? Are they evil or what?