This system of prioritization is known as 'aggro' (aggression), and mastering it is the most critical mechanical skill in the game.
This article will dissect the mathematics of sightlines, retargeting, and unit hitboxes to help you manipulate the AI flawlessly.
Vision and Targeting
If multiple enemies are within that radius, the AI will almost always lock onto the absolute closest target mathematically.
Understanding exactly how many tiles a unit can 'see' allows you to place distractions at the absolute maximum possible distance.
Count the squares to ensure perfect placement.If a unit is already locked onto a tower, it will ignore closer targets.Flying units often have different pathing rules.
The Geometry of Defense
Large tanks have massive hitboxes, meaning melee defenders can attack them from slightly further away than smaller troops.
For example, if an enemy Miner is locked onto your tower, you can deploy a large tank directly on top of him.
Unit CategoryAI PatternBuilding ChasersCompletely ignore all enemy troops, making them incredibly easy to kite across the entire map with cheap structuresMelee AssassinsOften have dash abilities that lock onto targets from far away; must be intercepted before the dash animation begins
Practice Makes Perfect
You must spend hours in friendly battles practicing these specific interactions until they become pure muscle memory.
Control the aggro, control the arena.
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