Arachnophobia is an upgrade that increases the rate at which Spider tanks and Widows gain experience.

v·d·e Brotherhood of Nod Fourth Tiberium War Arsenal

Offense Infantry Engineer Cyborg commando Vehicles Offense Crawler Avenger Attack bike Raider Scorpion tank Spider tank Mantis Flame tank Stealth tank Avatar Widow Specter Upgrades Trail of Flame Infiltration module Stealth field Stealth generator Backup systems Arachnophobia Mobile stealth generator Tiberium catalyst   Defense Infantry Engineer Devout Ascended Enlightened Black Hand Reaper High confessor Vehicles Defense Crawler Slave Centurion Reckoner Aftershock Underminer Structures Bunker Viper turret Rocket pod Burrow tunnel Flame column Obelisk of Light Disruption tower Incinerator Temple of Nod Upgrades Medical training Dark Armaments Drilltip Enhanced repairs Defensive matrix Improved concealment Enhanced shields Mobility matrix   Support Infantry Engineer Hijacker Vehicles Marauder Tyrant Aircraft Support Crawler Scalpel Venom Cobra Vertigo Salamander Basilisk Medusa Leviathan Support powers Eyes of the People Burrow mines Demoralize EMP countermeasures Obelisk of Life Cloaking field Firestorm ignition Decoy army Hack radar Subterranean strike Hand of Legion Vein detonation Risen monolith Mark of Kane Tiberium infusion Upgrades Cloak module Infusion engine Data worm Mobile stealth generator Spectrum beam Amplification overrides Charged capacitors Hangar bays   Other Miscellaneous Rioter Subterranean network • GST Uzziel • Gideon's Crawler Shared upgrades Tier 1 Tech Tier 2 Tech Tier 3 Tech Refire boost Accuracy boost Speed boost Range boost