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Tower (Tier 4)
From Liquipedia Dota 2 Wiki
Main Article: Towers
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Abilities
[edit]Backdoor Protection
[edit] Backdoor Protection
Passive / Aura
Affects
Allied Buildings
Affected structures take less damage when there are no enemy lane creeps nearby. Any damage they take gets quickly healed back.
Incoming Damage Reduction: 50%
Heal per Second: 180
Backdoor Disable Duration: 15
Aura Linger Duration: 0.5
All buildings within the allevated base area are affected. The detection radius originates from the Ancient and exceeds beyond the base. All buildings within the base gain and lose their protection in unison.
Detection Radius: 4000
All tier 2 towers have their own, independent Backdoor Protection. Their detection area is centerd around them and is limited to their close surroundings.
Tier 1 towers are unprotected at all times.
Tier 1 towers are unprotected at all times.
Detection Radius: 900
Illusions and all other summoned units deal even less damage to protected buildings.
Incoming Damage Reduction: 75%
Tower Protection
[edit] Tower Protection 
Passive / Aura
Affects
Allied Heroes
Grants additional armor and health regeneration to nearby allies.
Radius: 900
Armor Bonus: 5
Health Regen Bonus: 3
Aura Linger Duration: 0.5
Barracks Reinforcement
[edit] Barracks Reinforcement
Passive
Affects
Self
This tower is reinforced by each standing Barracks within the base.
Armor Bonus per Barracks: 4
True Sight
[edit] True Sight
Passive / Aura
Affects
Enemies
Reveals nearby invisible enemy units and wards, rendering them visible to allies.
Reveal Radius: 700
Aura Linger Duration: 0.5
Attack Type
[edit] Reinforced 
Passive
Affects
Self
Units of this attack classification take less damage from heroes, illusions and summoned units.
Hero Factor: 0.5
Illusion Factor: 0.6
Summoned Unit Factor: 0.9
Innate Properties
Units of this attack classification take less damage from Runty attacks.
Units of this attack classification take less damage from Runty attacks.
Runty Factor: 0.7
Innate Properties
Units of this attack classification take less damage from Piercing attacks.
Units of this attack classification take less damage from Piercing attacks.
Piercing Final Factor: 0.35
Innate Properties
Units of this attack classification also deal greatly increased damage to Reinforced units.
Units of this attack classification also deal greatly increased damage to Reinforced units.
Reinforced Factor: 2.5