Radiance

The tower now deals 20% more damage, attacks 20% faster, gains 20% bigger range and +77 AOE, the tower is now 7% more likely to land criticals, criticals do 177% more damage (2.25x dmg), and the tower now adapts to enemies by 0.0007x each hit and the tower now has its placement limit increased by 2. Nearby towers have their range, attack speed and damage boosted by 7%, cash gain boosted by 25% and timeskip boosted by 7 extra seconds. The tower now has a special conversion attack, a special extra attack which deals decent dps and inflicts every debuff, and the tower now has a special summon that explodes dealing huge damage (a lie it does microscopic dmg) around itself. Costs 4x more overall.