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 15 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 12 seconds and new stacks of damage do not refresh duration of old ones. There is also a 60% chance that the trespassing creep will permanently have its armor reduced by 5, which stacks up to 5 times.
Level Bonus: +0.2 armor reduction +0.1%-0.8% bonus base percent damage
Alert 
Trespasser Awareness 
