Here's a list of portal bosses in version 2.5. See the list for version 3.0 beta.
| Boss | Portal | Cost | Level | Reward |
|---|---|---|---|---|
| Allied Scrub | Allied training paper | 5 beastmen seals | 10 | 50 |
| Morion Worm | Worm food | 5 beastmen seals | 47 | 150 |
| Time Bomb | Bomb shard | 10 beastmen seals | 120 | 200 |
| Jester | Demon Bell | 10 beastmen seals | 250 | 300 |
| Armos Knight | Armos medallian | 15 beastmen seals | 100 | 500 |
| Eye of Cthulhu | Suspicious looking eye | 15 beastmen seals | 100 | 500 |
| Eater of Worlds | Corrupt worm food | 15 beastmen seals | 150 | 550 |
| Brain of Cthulhu | BloodySpine | 15 beastmen seals | 175 | 550 |
| Lanmolas | Book of Mudora | 15 beastmen seals | 180 | 550 |
| Moldorm | Hera key | 15 beastmen seals | 200 | 550 |
| Skeletron | Dungeon map | 15 beastmen seals | 200 | 600 |
| Poison | Virility Can | 15 beastmen seals | 300 | 500 |
| Mazaal | Mayan map | 20 beastmen seals | 250 | 550 |
| The Twins (Spazmatism, Retinaser) | Mechanical eye | 15 kindred seals | 250 | 1000 |
| The Destroyer | Mechanical worm | 15 kindred seals | 300 | 1050 |
| Skeletron Prime | Mechanical skull | 15 kindred seals | 350 | 1100 |
| Plantera | Plantera's bulb | 15 kindred seals | 400 | 1150 |
| Byakko | Gem of the West | 15 kindred seals | 1100 | 1200 |
| Genbu | Gem of the North | 15 kindred seals | 1100 | 1200 |
| Seiryu | Gem of the East | 15 kindred seals | 1100 | 1200 |
| Suzaku | Gem of the South | 15 kindred seals | 1100 | 1200 |
| Gaki, Onki, Rasetsu | Banishing charm | 20 kindred seals | 500 | 1000 |
| Rainemard | Lachesis orb | 20 kindred seals | 500 | 1000 |
| Leviathan | Ignis Fatuus | 20 kindred seals | 550 | 1000 |
| Bob Barbas | News orb | 20 kindred seals | 600 | 1000 |
| Awahondo | Avatar blood | 20 kindred seals | 1000 | 1500 |
| Huu Xalmo the Savage | Yagudo drink | 20 kindred seals | 1000 | 1500 |
| Ironclad Severer | Spheroid plate | 20 kindred seals | 1000 | 1500 |
| Marchelute | Tavnazia pass | 20 kindred seals | 1000 | 1500 |
| Three-Eyed Prozpuz | Old orc bow | 20 kindred seals | 1000 | 1500 |
| Legion | Rotting orb | 25 kindred seals | 1000 | 2500 |
| Lihzahrd Golem | Lihzahrd power cell | 15 kindred crests | 450 | 1200 |
| Duke Fishron | Truffle worm | 15 kindred crests | 500 | 1250 |
| Eccentric Eve | Jungle orb* | 20– kindred crests | 1500+ | 1000 |
| Echidna | Jungle orb* | 20– kindred crests | 1500+ | 1000 |
| Geryon | Time orb | 20 kindred crests | 1500+ | 1000 |
| One-Eyed Gwajboj | Old orc sword | 20 kindred crests | 1500 | 1750 |
| I-No | Evil guitar | 30 kindred crests | 3500 | 2750 |
| Shinryu Verus | Crimson traverser stone | 30 kindred crests | 5000 | 2750 |
| Eldora Adlanna, Nauthima Tiranadel | Goddess orb | 30 high kindred crests | 7000 | 3000 |
| Ashi Atora | Atlantian crystal | 30 high kindred crests | 7500 | 7000 |
| Hero of Time | Hyrule orb | Crafting only | 500 | 2500 |
| Kirin | God seal | Crafting only | 1550 | 2500 |
Rewards are in allied notes.
* The jungle orb will summon either Eccentric Eve or Echidna, at random.
– If the Allied Forces garden is at or above level 5, the price of the jungle orb will be 15 kindred crests. Due to what is presumably a bug in Battle Arena 2.6, up to that version this discount is given if the garden is at or below level 5.
+ If the levels of the players entering the battle sum to at least 1500, Eccentric Eve's level will be 50 above the highest level player, or Echidna or Geryon's level will be 200 above the highest level player.