There is an achievement to "fire the sunbeam" 20 times.
Where is the sunbeam and how do I fire it?
11 Answer
I'm assuming you mean the achievement titled 'Sunburner!' - this requires you to fire 'The Sunray' twenty times. The Sunray is a map-specific special tower located on Level 9 ('Stormcloud Temple') It initially cannot be fired, however for 100 gold you can add a Sunray Sorcerer that allows it to fire for 75-125 damage with a charge time of 19 seconds. You can purchase up to 4 sorcerers for the temple, allowing it a total of 225-275 damage with a 10-second charge time.
It does not automatically attack enemies - once it is ready, you must manually click on it and target a location.
Source: Kingdom Rush Wiki - Sunray Tower
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