Bouncing some ideas around my head and running the numbers on the enemy stats in Forbidden Portal, there are a lot of similarities that can be traced to the Golem Workshop. I can't test the build perfectly myself, but I do want to show what I think could work best.
The build requires 1 Mage that focuses primarily on buffs, and one or two Warriors, not Glass Cannons. The reason for this is because of the Terror Toad, which can cause your dragons to Berserk. So having points invested into DEF becomes more reasonable.
If you're familiar with the Workshop Workers two dragon build which you can find here, the stat alignments will be practically the same as that for the dragons. If you don't want to hop over there, here are the stats and stones:
Cleric: 122 INT, 16 VIT, 60 QCK, 24 AGI
Cleric Stones: Meditate
Regenerate, (Element Unique Spell), Rally, (Choice)
Scholar x3
Ambush x2
(Choice) is rather open-ended. I'm considering going with Bolster in order to prevent getting absolutely destroyed by my own dragons should they get afflicted with Berserk by the Terror Toad. Reflect is an option as well, to just straight-up return spells to sender. It can also just be Aid for that emergency heal that you need right away.
Warrior: 105 STR, 33 VIT, 52 DEF, 13 AGI
Warrior Stones: Scratch
Eliminate, (Element) Slash, (Choice), (Choice)
Berserker x3
Ambush x2
(Choice) has a lot of versatility. If you plan on using a second Warrior, however, make sure one of them is Rally so they can apply the buff themselves. Sap is always a good choice for restoring a small amount of HP where possible. Haste can be used for speed. Shred could have some utility against bosses, too. Really, you have options.
As for elements, I believe Wind remains the best element for the Cleric. The reasoning behind this is because of its strength against the Arcane enemies that tend to show up quite a bit. However, this makes the All-Seeing Eye perhaps the most dangerous enemy to this, as a bad Critical Hit from it could send the Cleric down in one go. Void Wyverns are also a threat, but they're slower and move after you, so they shouldn't be nearly as much as a danger.
Water is what I recommend for the Warriors, primarily to dispatch bosses as fast as possible. Water is also only vulnerable to just one of the Casters (albeit one of the faster ones, the Mindless Flight). Wave Slash should be able to make quick work of both bosses, since they are both weak to Water.
The stat spread for the Warrior is the way it is not just to make them tougher to take down from their own potential attacks from Terror Toads, but it also allows them to take down anything that is not a Fear Frog or Terror Toad in a Rallied Scratch + Elim. The lowered STR value means you won't be hurting yourself nearly as much as normal, and allows you to invest those stat points elsewhere.
As for strategy, the Cleric goes in the left-most position (Position 1), which will allow it to act first. Always Rally the Warrior that does not have Rally with the Cleric, and then consider using Disorient on enemies. Stats are invested into AGI for the purpose of being able to one-shot enemies weak to Wind (Arcane, Earth, Lightning) and save time for the Warrior(s). Just be sure to avoid using Disorient on Abberant Chacma or the Barhide Menace. If you encounter groups of these, you instead should use Rally on both Warriors, if you have two, or buff the Cleric themselves.
Warriors can simply Eliminate weakened enemies while Rallied, or Scratch to set them up. With two Warriors, this is even easier, and will allow the Cleric time to generate even more Breath or heal since the Cleric doesn't have to perform any sort of set-up with Disorient; the two Warriors can just tag-team down enemies over and over while Rallied.
Fear Frogs should not pose much of a problem. The main trick comes to Terror Toads. Against them, do not Rally at the start; you should try and have your Cleric Disorient them if possible. The main reason behind not using Rally? If your dragons go Berserk, they're going to start possibly targeting allies with their buffed STR, which will only compound the pain. So just leave the Rally off, have the Cleric use Regeneration where needed, Meditate to keep Breath topped off to cast it twice just in case, and whittle it down. Play it safe against them.
Keep in mind that a fair chunk of this is theoretical, and I can't exactly test this build right away, as I'd have to train up more dragons. However, if you do want to try this out, let me know, and tell me if there's any way to improve it! This is my first time trying to think of a sort of "plan" for a team, even though I'm using much inspiration from another build. On that note, a huge thanks to @celelorien for their original Workshop Workers build that I took into the Forbidden Portal and am finding success with! Hopefully, this can work out for everyone in the end. Also, be sure to take a read at their guide for more in-depth tips that I might not have put in here.
EDIT: Well, just woke up and maybe I was overthinking everything. Oh well, seems like me.
The build requires 1 Mage that focuses primarily on buffs, and one or two Warriors, not Glass Cannons. The reason for this is because of the Terror Toad, which can cause your dragons to Berserk. So having points invested into DEF becomes more reasonable.
If you're familiar with the Workshop Workers two dragon build which you can find here, the stat alignments will be practically the same as that for the dragons. If you don't want to hop over there, here are the stats and stones:
Cleric: 122 INT, 16 VIT, 60 QCK, 24 AGI
Cleric Stones: Meditate
Regenerate, (Element Unique Spell), Rally, (Choice)
Scholar x3
Ambush x2
(Choice) is rather open-ended. I'm considering going with Bolster in order to prevent getting absolutely destroyed by my own dragons should they get afflicted with Berserk by the Terror Toad. Reflect is an option as well, to just straight-up return spells to sender. It can also just be Aid for that emergency heal that you need right away.
Warrior: 105 STR, 33 VIT, 52 DEF, 13 AGI
Warrior Stones: Scratch
Eliminate, (Element) Slash, (Choice), (Choice)
Berserker x3
Ambush x2
(Choice) has a lot of versatility. If you plan on using a second Warrior, however, make sure one of them is Rally so they can apply the buff themselves. Sap is always a good choice for restoring a small amount of HP where possible. Haste can be used for speed. Shred could have some utility against bosses, too. Really, you have options.
As for elements, I believe Wind remains the best element for the Cleric. The reasoning behind this is because of its strength against the Arcane enemies that tend to show up quite a bit. However, this makes the All-Seeing Eye perhaps the most dangerous enemy to this, as a bad Critical Hit from it could send the Cleric down in one go. Void Wyverns are also a threat, but they're slower and move after you, so they shouldn't be nearly as much as a danger.
Water is what I recommend for the Warriors, primarily to dispatch bosses as fast as possible. Water is also only vulnerable to just one of the Casters (albeit one of the faster ones, the Mindless Flight). Wave Slash should be able to make quick work of both bosses, since they are both weak to Water.
The stat spread for the Warrior is the way it is not just to make them tougher to take down from their own potential attacks from Terror Toads, but it also allows them to take down anything that is not a Fear Frog or Terror Toad in a Rallied Scratch + Elim. The lowered STR value means you won't be hurting yourself nearly as much as normal, and allows you to invest those stat points elsewhere.
As for strategy, the Cleric goes in the left-most position (Position 1), which will allow it to act first. Always Rally the Warrior that does not have Rally with the Cleric, and then consider using Disorient on enemies. Stats are invested into AGI for the purpose of being able to one-shot enemies weak to Wind (Arcane, Earth, Lightning) and save time for the Warrior(s). Just be sure to avoid using Disorient on Abberant Chacma or the Barhide Menace. If you encounter groups of these, you instead should use Rally on both Warriors, if you have two, or buff the Cleric themselves.
Warriors can simply Eliminate weakened enemies while Rallied, or Scratch to set them up. With two Warriors, this is even easier, and will allow the Cleric time to generate even more Breath or heal since the Cleric doesn't have to perform any sort of set-up with Disorient; the two Warriors can just tag-team down enemies over and over while Rallied.
Fear Frogs should not pose much of a problem. The main trick comes to Terror Toads. Against them, do not Rally at the start; you should try and have your Cleric Disorient them if possible. The main reason behind not using Rally? If your dragons go Berserk, they're going to start possibly targeting allies with their buffed STR, which will only compound the pain. So just leave the Rally off, have the Cleric use Regeneration where needed, Meditate to keep Breath topped off to cast it twice just in case, and whittle it down. Play it safe against them.
Keep in mind that a fair chunk of this is theoretical, and I can't exactly test this build right away, as I'd have to train up more dragons. However, if you do want to try this out, let me know, and tell me if there's any way to improve it! This is my first time trying to think of a sort of "plan" for a team, even though I'm using much inspiration from another build. On that note, a huge thanks to @celelorien for their original Workshop Workers build that I took into the Forbidden Portal and am finding success with! Hopefully, this can work out for everyone in the end. Also, be sure to take a read at their guide for more in-depth tips that I might not have put in here.
EDIT: Well, just woke up and maybe I was overthinking everything. Oh well, seems like me.