Towers in 500 range get alerted whenever a creep of size air, champion or boss enters the sentry's attack range. They have their base damage increased by 7.5% for 10 seconds. Does not stack.
Level Bonus: +0.5% base damage bonus
Trespasser Awareness
This tower strengthens its defenses when uninvited units enter its territory. It gains bonus 5%-40% base percent damage with each creep entering its attack range, based on the creep's size. Bonus damage lasts 8 seconds and new stacks of damage do not refresh duration of old ones. There is also a 50% chance that the trespassing creep will permanently have its armor reduced by 4, which stacks up to 5 times.
Level Bonus: +0.15 armor reduction +0.1%-0.8% bonus base percent damage
Alert 
Trespasser Awareness 
