The tree alights preeetty easily; it's thousands of years old, after all. It suffers 10 fire damage (and will continue to do so each turn until it's extinguished).

Tree 1 screams in rage. Instead of attempting to slam you, though, it straightens as the Judgment Disc in the center of the floor begins to glow a bright white.

WIS saving throw, Perspicacious!

Wis Save: 7

(Oof)

You take 9 psychic damage as you are attacked by mind spike.

And it's your turn again!

With the guarding tree set aflame, Perspicacious disengages from the attacking tree, rolls out of the way and runs 30 feet to the other side of the room, turning at the last second to send another shot at the tree (Tree 1). Chime runs as well, meeting up with her and hopping up on to her coat.

Empty Bow: Attack: 16 Damage: 9

The flaming tree flails about, attempting to crush the flames on its trunk with its branches. As it does so, it suffers another 10 fire damage and leaves an opening to the doors to the Solarium!

Tree 1 crashes down in your direction, attempting to crush you before you can make your escape.

Attack: 8 Damage: 17 bludgeoning!

(OOCH. Make than an additional 13 damage!)

Perspicacious sees the tree coming for her. She expected this, but the flailing tree on fire momentarily distracts her, and she takes the hit from the first tree. She's able to avoid some of the damage by being quick on her feet (uncanny Dodge for half damage) and makes a dash for the door to the Solarium. She pauses just one moment at the threshold to catch her breath, then opens it.

Second Wind: 8

The door opens into darkness. Chime quickly scales your back to rest on your shoulder, one tiny metallic hand gripping your collar. You step over the threshold, shutting the door on the chaos behind you.

Tony, you see a flash of bright light as you are teleported away.

You are no longer standing on the dais before the guardian trees. You find yourself in a huge, flooded amphitheater. In fact, it's the same room that Vox showed you a short while ago in the Atrium. This is the Solarium, and the scene hasn't changed. A kenku, dressed in nautical attire and holding a long, thin boatcatch pole floats ten feet in the air above the the center of a raised platform about forty feet from you. His eyes are that familiar milky white, as are the eyes of the children surrounding him. Above his head swirls a thundercloud. Lightning flashes occasionally within it, and a deluge of rain pours downward, drenching the platform and the children. Nearly all of the rainwater is running off to accumulate in the lower section of the amphitheater; there's no way to tell how deep it is, but it's only about a five foot drop from the platform, so... Probably pretty deep. 

Speaking of the children, one of them is a small goblin girl... 

Tony feels his pulse quicken and for a moment, he nearly charges into the center of the thunderstorm, but he thinks better of himself. The moblin realizes that moving too quickly could injure the hostages, or even worse, Tonya.

Tony is going to stealth: 27 and start moving around toward Tonya.

Actually, Tony, as you start to move you hear a soft clink. Looking down, you see that your hands have been bound by a pair of ancient, heavy manacles. 

(Disadvantage on that stealth check if you still want to make it, T!)

Just after noticing your bonds, there is a flash of light behind you. It's Amaruve! Followed a few moments later by flashes that announce the arrival of Fiorello, then Jean. Amaruve and Jean are unbound, but Fiorello... His manacles are chained to an iron loop in the floor, and his beak and his wings are restrained by leather straps. His eyes dart wildly as he takes in his surroundings. 

The rest of you see everything as it has already been described. The kenku and the children don't seem to notice your sudden appearance...

The plan was good, so I’m keeping it! 14!

Fourteen total.

Amaruve is ready for action, but he shows restraint. The threat doesn't seem immediate. While time is a factor he waits just a moment to look around. Does the Raven sppear to be the source of this spell? Can Amaruve reach Fiorello unnoticed? Is there any cover here? Where is Prespicacious? Is she Ok? He should focus... He'll approach this with the pack.

(Perception: 17)

You are entirely out in the open, and yet apparently unnoticed. All of you are in a clump at the opposite end of the large platform in this enormous room. You realize that the platform is subtly slanted, and you are at the lower end. The water runs toward you like a sluice.

Amaruve moves to free Fiorello.

His wings and beak are bound by cleverly woven leather straps. His hands, though, are bound by heavy (but ancient) manacles. 

DC 10 STR check to break the straps

DC 20 STR to break the chains (same goes for Tony)

Mmm... Amaruve tries to free his beak first then.

(Strength: 13)

"... in the Nine Hells?!" Jean exclaimed, looking around wildly. Spotting the water rushing towards them she then said "This is not what I meant when I said I wanted a bath!"

(We'll say that roll was for the beak and his arms/wings)

"Gah! Ugh, my thanks, Amaruve." Fiorello shakes his head and pulls at his chains. "What do you think? Can you help me with these?"

The water continues to rise. On your side of the platform, the water is now lapping at the edge. 

Tony, you make your way up the sluice-like platform. You might be imagining things, but the rain is starting to come down a bit harder. Neither the kenku nor the children give any sign that they have noticed your approach...

Tony, thinking himself clever, tries to pick the lock on the chains... and fails. However! Thinking fast on his feet, Tony tosses a crowbar to the others... and makes it about halfway, muttering, “Ah come on...”