Portal Defense: How to Build 4-AI 4-Psionic Defense

To neutralize backline hackers and high-threat infiltrators in Portal Defense, transition your defensive composition to activate both the 4-AI and 4-Psionic synergies while maintaining a bank reserve of at least 30 gold. This combination mitigates incoming burst damage, weakens backline attackers, and leaves enough gold to fund late-game shop refreshes.

Core Composition Synergies

Combining 4-AI and 4-Psionic units creates a defensive buffer that stabilizes your board against specialized offensive setups.

• 4-AI Activation: Grants static mitigation buffs to your entire defensive line. This defensive multiplier prevents your frontline units from collapsing under heavy burst damage.
• 4-Psionic Activation: Targets aggressive enemy flankers with debuffs that reduce incoming damage efficiency. This stops backline disruptors from quickly executing your primary damage dealers.

How to Counter Mech Draven and Backline Hackers

High-damage threats like 3-star Mech Draven rely on bypassing your perimeter to dismantle fragile backline units. Standard armor or health investments fail against this level of burst damage.

1. Absorb the Initial Jump: Position your AI-buffed frontline defenders to catch jumping units as they clear the outer perimeter.
2. Apply Psionic Debuffs: The activated 4-Psionic synergy weakens the attacking unit upon contact, dampening its offensive output before it can wipe your backline.
3. Focus Fire: Hold the enemy unit in place with your durable defenders while your backline carries eliminate it. The reduced incoming damage effectively turns high-tier threats into passive energy sources for your defenders.

Economy Management: Keeping the 30 Gold Reserve

Maintaining financial discipline is required to sustain this composition into late-game rounds.

• Reserve Threshold: Never spend below 30 gold once your basic defensive unit core is active.
• Purpose of the Fund: This 30-gold surplus acts as emergency capital to reroll for high-tier upgrades or pivot into late-game units during subsequent rounds.
• Unit Selection: Avoid spending gold on secondary units that do not directly contribute to the 4-AI or 4-Psionic milestones.

Limitations and Contingencies

While this hybrid composition provides high survival utility, players must manage specific trade-offs:

• Lower Burst Damage: Prioritizing utility and durability means combat rounds will last longer. Ensure your carries maintain sufficient sustained damage so waves do not leak before being cleared.
• Shop Dependency: Hitting the 4-AI and 4-Psionic thresholds requires specific unit drops. If essential units do not appear in the shop, hold temporary frontline substitutes rather than rolling down to zero gold to force the build.