Spire

Spire
Info
Description	"A defensive Spire that shoots down incoming projectiles"
Purpose	Destroys enemy projectiles
Placement
Type	Defensive
Slot	Dome Backside

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The Spire is a mainly defensive gadget that shoots down incoming projectiles. It takes up the Dome Backside gadget slot. It has two sets of mutually exclusive upgrades and as all defensive gadgets an autonomy upgrade. By default it has 1 shot before recharging for 5 seconds and takes 0.5 seconds to target.

Upgrades

Mutually Exclusive

The Spire has two sets of mutually exclusive upgrades(meaning you can only get one of the two):

• Burst Fire and Sustained Fire
• Projectile Split Path and Energy Trap Path

Burst Fire

Burst Fire with Capacity 2

"Fires in short bursts, dealing well with salvos."

Upgrade Name	Default	Burst Fire	Capacity
Shots before Recharge	1	3	3 + 1 for every purchase
Recharge Time	5 sec	8 sec	8 sec
Other	-	-	Iron Cost +1 each purchase
Upgrade Image

Sustained Fire

Sustained Fire with Cooldown 3

"Brings the recharge time down to a near zero, enabling a very steady fire pace."

Upgrade Name	Default	Sustained Fire	Improved Cooling
Shots before Recharge	1	1	1
Recharge Time	5 sec	1.5 sec	1.5 sec - (0.36 - 0.02 * x) / 2 * (x + 1) x - amount bought In simpler terms, the cooldown is initially reduced by 0.18 sec and this value is decreased by 0.02 each time. 1.50 -> 1.32 -> 1.16 -> 1.02 -> 0.90 -> 0.80 -> 0.72 -> 0.66 -> 0.62 -> 0.60
Upgrade Image

Projectile Split Path

Split Projectile path with all upgrades and Sustained Fire

"Hit projectiles split into multiple smaller ones, dealing damage to enemies. The amount of split projectiles depends on the potency of the incoming projectile."

Notice

You can get Fast Split before getting Ground Split meaning that the Additional Split Projectiles will be 100%. After getting "Ground Split" too, Additional Split Projectiles will be 200%.

Upgrade Name	Projectile Split	Ground Split	Fast Split
Split Shot Speed	200	doesn't affect	350
Additional Split Projectiles	0%	+100%	+100%
360o Split	-	Yes	-
Upgrade Image

Energy Trap Path

Shooting down a flyers' projectile

"Shooting down a projectile generates an energy trap, that will catch more projectiles. How much it can capture depends on the potency of the incoming projectile."

The stronger the shot down projectile is, the bigger, stronger and more durable is the trap.

Notice

You can get Monster Trap before getting Catalyst Trap meaning that the duration of the trap is the one of Energy Trap.

Stronger projectiles result in better and bigger traps

Upgrade Name	Energy Trap	Catalyst Trap	Monster Trap
Damage Absorption	100%	250%	doesn't affect
Duration Simple Duration Actual	4 sec 4 * max(0.7, factor1)	6 sec 6 * max(0.7, factor1)	doesn't affect
Radius Simple Radius Actual	25 clamp 25 * factor1 between 15 and 60	33 clamp 33 * factor1 between 15 and 60	doesn't affect
Stun Monsters	No	No	Yes
Upgrade Image

¹ - factor is a value calculated using this formula: sqrt(projectileDamage) / 6

Autonomy

The Spire works even when you are not in the control station and the wave has started.

Tech tree example

Tier 0	Tier 1	Tier 2	Tier 3
	\ exclusive choice	*exclusive
\/	\/	choice --->
\/	\/	*exclusive
\/	\/	choice --->
\/	*exclusive ->
\/	*exclusive ->
choice --->