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.
How Units See the Arena
When a unit is deployed or finishes destroying a target, it scans its specific sight range for the closest valid enemy.
If a massive, slow-moving tank is lumbering toward your tower, you do not need to place your defense directly in front of it.
Count the squares to ensure perfect placement.You must use a stun spell (like Zap) to force it to rescan.They ignore the river and take direct diagonal lines.
The Geometry of Defense
You can use the physical bulk of your own units to literally push enemy troops out of their preferred path.
The physical mass of the tank will actually push the Miner backward, forcing him to lose range on the tower and retarget onto the tank.
Troop TypeAggro BehaviorSiege TargetersCompletely ignore all enemy troops, making them incredibly easy to kite across the entire map with cheap structuresBanditsOften have dash abilities that lock onto targets from far away; must be intercepted before the dash animation begins
Drilling the Mechanics
Reading about aggro ranges is completely different from actually executing pixel-perfect placements in the heat of a live match.
Control the aggro, control the arena.
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