Trainees who survive the Trial of Fire and Ice are teleported to the Trial of the Elements. This is actually five separate, disconnected caverns that can only be accessed through teleportation portals.

Trainees appear on a teleportation portal on a dais in the center of an octagonal room. There are four daises on four of the walls, each with a teleportation portal. Before each is a circle inscribed with runes and a sigil marking their element: a cloud with a lightning bolt on the east for the Trial of Air; a symbol of flame on the south for the Trial of Fire; a drop of water on the west for the Trial of Water; and a gem on the north for the Trial of Earth.

There are four statues on the remaining corners: a cat, a winged person, a snake, and a demon's skull. When the room is entered, the skull statue will speak and tell trainees that they may embark on a psychic contest of wills with each statue to receive a benefit that will help their trials. For each, the Game Master will roll a d20+5. The trainee rolls a d20 and adds their Wisdom bonus. If the trainee's is higher, they win the contest and receive a magical benefit that lasts 24 hours. If they fail, there is no harm but they do not receive the bonus and cannot try again.

Success against the cat statue grants the magical ability of Spider Climb for 24 hours, while the winged statue grants Feather Fall, the snake grants immunity to poisons and venom, and the skull grants immunity to electrical/lightning damage. These benefits only last 24 hours.

Trainees can tackle the trials in any order they choose, but cannot teleport out until they have survived all four.

Trial of Air

Trainees must cross a cloudy room by leaping from pillar to pillar. If they slip, it's a 30 foot drop, and they will take damage unless they have Feather Fall. Some of the pillars delivery electrical damage unless they have immunity. And they may also be attacked by flying creatures (signified by hawks here, but Game Masters may choose to use harpies, elementals, or other flying creatures).

If they make it to the dais on the far wall, they can take a shard of crystal and be teleported back to the central room.

I'm not thrilled with how to tops of the outcrops look. Any recommendation on sheet effects settings is welcome.

Trial of Fire

Here, trainees leap from pillar to pillar, trying to avoid falling into the lava. (If they acquired a red crystal from the Trial of Fire and Ice, that will come in handy here.) There are also Fire Elementals (I used bonfire symbols from Darklands City -- love Mike Schley's newest symbol but the style didn't really work here.)

Trial of Water

The water is swimmable if trainees fall in, but it's icy cold and they will take damage unless they have a blue shard from the Trial of Fire and Ice. There are also sharks in the water as well as tentacle creatures.

Trial of Earth

This room is filled with venomous snakes and giant spiders, and diseased giant rats, so immunity to poison would be helpful here. The mushrooms are also poisonous if anyone is foolish enough to eat them.

Trainees who collect a shard from each of the rooms can activate the teleportation portal in the main room, which will transport them to the Ritual Room in the temple's basement.

Any recommendations on sheet effects, especially for the tops of the outcrops, are welcome.

The trainees who survive still have two final tests before they graduate: the Trial of Fire and Ice, and the Trial of the Elements. Those who succeed at both trials will join the ranks of the monks of Zhao Guang Si. Those who fail are generally dead.

For the Trial of Fire and Ice, the initiate must climb the cliff walls without benefit of rope and then make their way through the Hu0 Yu Bing Caverns to the Labyrinth of Fire and Ice, a path magically made of ice and molten lava.

In addition to venomous snakes and giant spiders, the caverns are home to two undead perils as well. When a trainee dies in the caverns, their body is left to rot. Once the worms have picked the bones clean, their bones reanimate as a skeleton, and will attack the next trainees who enter. In addition, their spirits also haunt the caverns and can attack those who enter. (I used purple will-o-wisps to look like the spirits' eyes.)

There are two magical shards of crystal that trainees can try to get, which will help with both the Labyrinth of Fire and Ice as well as with the Trial of the Elements. The first is a shard from a red crystal on the other side of a pool of lava. If the lava wasn't barrier enough, the room is also guarded by a pair of lesser demons.

The second is a blue crystal on the other side of an icy lake in a room guarded by a pair of ice devils.

Trainees don't need to even try to get shards from either crystal, but they will sure help if they do.

At the end of the caverns is the Labyrinth of Fire and Ice: an icy path marked by red hot lava. A statue on the other side of the room will animate when anyone enters, and tell them that the only exit is a teleportation portal in the center of the labyrinth. It will only activate for those who walk the path. If anyone attempts to bypass the path, it will not activate.

Every turn that a trainee walks the path, they must make a Constitution saving throw. Failing results in cold damage unless they possess a shard of the blue crystal. They must also make a Dexterity saving throw every turn. Failing means they slip and touch the lava, resulting in fire damage unless they possess the red shard.

If they make it to the teleportation circle in the center, they are teleported to the Trial of the Elements.

Here are the five above-ground levels of the temple. As the description notes, the lanterns are covered with a red gauze (except in the library), which gives everything an ominous red glow.

First Floor

Second Floor

(Most of it is a balcony overlooking the statue on the first floor.)

Third Floor

Fourth Floor

Fifth Floor

I mentioned this on your FB post, but I love Spectrum for overland because of the diversity of mountains, hills, and trees, and how well they also work for both large overland maps as well as smaller isometric scenes.

This is a clever approach and it looks very nice. I always learn so much when cartographers share their tricks and techniques. Thank you!