Boosters

How to pick

• You roll once per stage: the game offers 3 boosters and you pick 1. A booster you pick is more likely to be offered again, and boosters level up to 4 (around level 3 they're about twice as strong). So commit early: pick the same 1–2 boosters every time they're offered so they reach level 3–4, instead of spreading over many.
• Boosters do one of three things: send extra units into your rival's lane, shut down or slow your rival's towers, or help you (your towers, spells, gold, or your lane).
• Defense first. If enemies are leaking, take a booster that helps you. If your defense is holding, take pressure boosters, because your rival has to deal with them on top of their waves.
• When you send units, pick the armor your rival's towers handle worst: if they have mostly magic towers, send magic-armored units; if mostly physical or artillery, send physical-armored units. Rivals using Gusano, Mecha or soldiers have trouble with flying units.
• Tower-disable boosters (Ventisca, Torre de Granja, Piedra Fundida) hit your rival's whole defense at once. They're strongest when your rival is already under pressure, like the boss stage.
• Your rival rolls too. That's why the decks now cover flying enemies in every arena and carry Mecha where boosters can freeze your towers. Whether Mecha's aura actually blocks booster freezes is not tested yet: check it in a match.

What each booster does is read from its description in the game. Which picks are best is my advice, not tested in matches.

Arena 3 · Bosque de Silveroak

Good picks

Globos Goblin

Units → rival

A flying bomber: great against rivals who rely on soldiers, Gusano or Mecha.

Gran Chamán Orco

Units → rival

Magic armor, and its lightning stuns your rival's soldiers and hero in an area.

Llamado de la Madre Criadora

Units → rival

High-health spider with magic armor that keeps spawning bigger spiderlings: good against physical-heavy rivals.

What your rival can send you: Your rival's Globos Goblin flies: keep Fuerte de Ballesteros and Gema near the exit. Only 3 of the 11 boosters in this arena were screenshotted.

All boosters seen

3 of the 11 boosters in this arena are screenshotted.

Booster	What it does	Armor	Health	Damage	Speed	Description
Globos GoblinFlies	Units → rival	No armor	Medio	Medio	Medio	Enemigo volador que lanza bombas sobre las unidades debajo de él
Gran Chamán Orco	Units → rival	Magic armor	Medio	Bajo	—	Chamán poderoso que lanza un rayo que aturde y daña a las unidades alrededor del área objetivo. Its lightning stuns and damages units in an area.
Llamado de la Madre Criadora	Units → rival	Magic armor	Alto	Medio	Medio	Una araña gigante que pone huevos para engendrar crías más grandes.

Arena 6 · Montañas Tormentosas

Good picks

Ventisca

Rival's towers

Freezes your rival's towers so they can't attack. The strongest pressure pick here.

Pájaro de Trueno

Units → rival

Flying, magic armor, high ranged damage: hard for physical or ground-only defenses.

Golems Voladores Mágicos / Blindados

Units → rival

Flying golem groups. Pick the magic version against physical rivals and the armored one against magic rivals.

Congelación

Helps you

Slows the enemies in your own lane so they move and attack slower. A safe defensive pick.

Trollzerker

Units → rival

Very high health and physical armor, gets stronger at low health.

What your rival can send you: Your rival can freeze your towers with Ventisca: keep Mecha in the center. Pájaro de Trueno, both flying golems and Dragubones fly: Gema and Mago Arcano can shoot them.

All boosters seen

8 of the 14 boosters in this arena are screenshotted.

Booster	What it does	Armor	Health	Damage	Speed	Description
Ventisca	Rival's towers	—	—	—	—	Congela temporalmente las torres enemigas, haciéndolas incapaces de atacar
DragubonesFlies	Units → rival	No armor	Bajo	Bajo	Medio	Una estampida de pequeños dragones que vuelan sobre cualquier enemigo que intente bloquearlos. A stampede of small flying dragons that fly over anything trying to block them.
Golems Voladores BlindadosFlies	Units → rival	Physical armor	Medio	Ninguno	Medio	Enemigo volador blindado que viene en grupos
Golems Voladores MágicosFlies	Units → rival	Magic armor	Medio	Ninguno	Medio	Un grupo de gólems voladores con resistencia mágica
Presagio de Escarcha	Units → rival	Magic armor	Medio	Bajo	Bajo	Poderoso arcanista Troll que usa teletransporte para mover un grupo de enemigos adelante. Teleports a group of units forward.
Pájaro de TruenoFlies	Units → rival	Magic armor	Medio	Alto	Medio	Un volador imparable que lanza truenos sobre cualquier unidad que se encuentre debajo
Trollzerker	Units → rival	Physical armor	Muy Alto	Alto	—	Guerrero feroz de la raza Troll. Cuando su salud es baja, se enfurece, aumentando su fuerza y velocidad. Gets stronger and faster when its health is low.
Congelación	Helps you	—	—	—	—	Congela temporalmente a las unidades enemigas, haciéndolas moverse y atacar más lento

Arena 9 · Guarida de Bandidos

Good picks

Torre de Granja

Rival's towers

Turns your rival's towers into useless farms for a while. The strongest pressure pick here.

Triturador

Units → rival

Very high health, physical armor, and its rocks disable your rival's towers and units.

Planeadores Bandidos

Units → rival

Fly over defenses and hit hard: good against soldier-heavy rivals.

Golems Acorazados

Units → rival

High-health physical-armor group: good against physical-damage rivals.

What your rival can send you: Your rival can turn your towers into farms (Torre de Granja) or disable them with Triturador's rocks: that's why Mecha is in this deck. Planeadores Bandidos fly: Fuerte handles them.

All boosters seen

7 of the 14 boosters in this arena are screenshotted.

Booster	What it does	Armor	Health	Damage	Speed	Description
Torre de Granja	Rival's towers	—	—	—	—	Temporalmente convierte las torres del oponente en granjas inútiles
Emboscadores	Units → rival	No armor	Muy bajo	Ninguno	Alto	Expertos en infiltración, pueden atravesar todas las defensas sin ser detectados. Pass through all defenses without being detected.
Golems Acorazados	Units → rival	Physical armor	Alto	Alto	Bajo	Grupo de golems pequeños y grandes con armadura física
Guerradillos	Units → rival	Physical armor	Bajo	Muy bajo	Muy Alto	Enemigo con armadura física que rueda muy rápido cuando no está bloqueado
Líder de Bandidos	Units → rival	Physical armor	Alto	Medio	Bajo	Líder feroz que organiza y equipa bandidos para la batalla
Planeadores BandidosFlies	Units → rival	No armor	Medio	Alto	Medio	Bandidos que usan un planeador para volar sobre las defensas; en caso de daño grave, se estrellan contra sus enemigos. Glide over defenses and crash into enemies when badly hurt.
Triturador	Units → rival	Physical armor	Muy Alto	Alto	Bajo	Bruto de alto rango que avanza lanzando rocas a unidades y torres, desactivándolas por unos segundos. Throws rocks that disable towers for a few seconds.

Arena 12 · Valle Desolado

Good picks

Torre Poderosa

Helps you

More damage for all your towers. The safest pick if your defense needs help.

Mercader de la Muerte

Helps you

More gold per kill: faster upgrades, best picked early.

Maestro de Hechizos

Helps you

Shorter spell cooldowns: more Golpe Definitivo and Ráfaga Solar.

Piedra Fundida

Rival's towers

Buries your rival's towers in rock for a few seconds. The strongest pressure pick here.

Invocación Espectral

Helps you

Enemies you kill may come back as ghosts on your rival's side: free pressure from your own defense.

Llamado del Dragón

Units → rival

Flying dragon with magic armor and high ranged damage.

What your rival can send you: Your rival can bury your towers with Piedra Fundida: keep Mecha in the center. Llamado del Dragón, Murciélago Chillón and Llamador de Cuervos' crows fly: Tesla and Gema handle them.

All boosters seen

11 of the 13 boosters in this arena are screenshotted.

Booster	What it does	Armor	Health	Damage	Speed	Description
Piedra Fundida	Rival's towers	—	—	—	—	Genera terremotos en todo el campo de batalla, enterrando torres enemigas en roca durante unos segundos.
Elemental de Magma	Units → rival	Physical armor	Muy Alto	Alto	—	Un poderoso Elemental de Magma aparece en un punto aleatorio del mapa. Tras ser derrotado, entra en una forma de roca para curarse y revivir Appears at a random point of the map; after dying it turns to rock, heals and revives. Speed not captured.
Herrero de las Sombras	Units → rival	Physical armor	Alto	Medio	Bajo	Unidad resistente que repara cualquier armadura rota de Reclutas y Caballeros Repairs the broken armor of Rookies and Knights.
Llamado del DragónFlies	Units → rival	Magic armor	Alto	Alto	Bajo	Gran dragón volador con resistencia mágica que ataca a cualquier enemigo cercano a distancia.
Llamador de Cuervos	Units → rival	Magic armor	Medio	Bajo	Bajo	Un Invocador de Cuervos Sombríos que invoca Cuervos Oscuros cada pocos segundos. Keeps summoning flying Dark Crows.
Murciélago ChillónFlies	Units → rival	No armor	Alto	—	Alto	Un murciélago gigante que utiliza su chillido supersónico para aturdir a los enemigos cercanos. Its screech stuns nearby enemies.
Sacerdote Oscuro	Units → rival	Magic armor	Medio	Bajo	Bajo	Un enemigo con resistencia mágica que transforma unidades en Reclutas Oscuros o Caballeros Oscuros. Turns units into Dark Rookies or Dark Knights.
Invocación Espectral	Helps you	—	—	—	—	Los enemigos muertos tienen una probabilidad de aparecer como fantasmas en el lado del oponente
Maestro de Hechizos	Helps you	—	—	—	—	Reduce el tiempo de reutilización de todos los hechizos
Mercader de la Muerte	Helps you	—	—	—	—	Aumenta el oro ganado al matar enemigos
Torre Poderosa	Helps you	—	—	—	—	Aumenta el daño infligido por todas las torres

Arena 15 · Fronteras de Hammerhold

Good picks

Tormenta de Arena

Rival's towers

Slows your rival's tower attack speed for a while.

Pájaro Relámpago

Units → rival

Flying, magic armor, true damage and stuns: strong against almost any rival.

Nido de Avispas

Units → rival

Keeps releasing flying wasps: very strong against rivals without area damage that hits the air.

Rey Escorpión

Units → rival

High health, magic armor, summons Giant Scorpions behind him.

Destino Llameante

Helps you

Eruptions throw burning rocks around enemies. A defensive pick for your own lane.

What your rival can send you: Your rival's Nido de Avispas and Pájaro Relámpago fly: Tesla and Gema are your answer. Tormenta de Arena slows your towers (not a full disable, so Mecha probably doesn't stop it).

All boosters seen

8 boosters screenshotted.

Booster	What it does	Armor	Health	Damage	Speed	Description
Tormenta de Arena	Rival's towers	—	—	—	—	Una tormenta de arena feroz que ciega las torres del oponente, reduciendo su velocidad de ataque por un corto tiempo. Slows the rival's tower attack speed for a short time (a slow, not a full disable).
Lagarto Guerrero	Units → rival	Physical armor	Bajo	Muy bajo	Muy Alto	Se enrolla en una bola con pinchos y rueda por el camino a una velocidad increíble.
Nido de AvispasFlies	Units → rival	No armor	Bajo	Muy bajo	Medio	Libera periódicamente un enjambre de Avispas Gigantes que vuelan por el camino hasta ser destruidas. Releases flying Giant Wasps until destroyed.
Pájaro RelámpagoFlies	Units → rival	Magic armor	Medio	Alto	Medio	Desata un Trueno debajo de él, causando daño verdadero y aturdiendo a cualquiera que quede debajo. Its thunder does true damage and stuns whatever is under it.
Rey Escorpión	Units → rival	Magic armor	Alto	Medio	Medio	Invoca Escorpiones Gigantes que invaden el camino detrás de él. Summons Giant Scorpions behind him.
Tumbleweeders	Units → rival	No armor	Muy bajo	Ninguno	Alto	Un matón del desierto que se oculta bajo una planta rodadora, sin poder ser atacado hasta que se acerca para combatir. Can't be attacked until they get close.
Bombas de humo	Helps you	—	—	—	—	Pantalla de humo que impide apuntar a cualquier aliado dentro.
Destino Llameante	Helps you	—	—	—	—	Provoca erupciones violentas que envían rocas ardientes volando alrededor de los enemigos.