Demon Portal

Description :
Spawns melee demons that fight for you. Maximum of 2 demons per portal.

Upgrades:
Tier 1: Tier 2: Tier 3:
 * Bulk Up: Increases demon health by 20%
 * Rapid Arrival: Increases rearm speed by 30%.
 * Bounty Hunter: Rewards 10 extra gold when a demon kills a unit.
 * Volatile Demise: A demon's death causes an explosion, damaging nearby enemies equal to its damage.
 * Reinforcement: Increases max demons by 1.
 * Unholy Strength: Increases demon damage by 200%
 * Demon Lord: Summons a powerful demon lord. Lord increases max health by 1 when it gets a kill.
 * Demonology: demon count increased by 2.