Murder of Crows is obtained after defeating the Crow in Comstock Center Rooftops. Murder of Crows lets players unleash a swarm of crows that will attack enemies. The trap version is referred to as a Crows' Nest, which will unleash crows upon any enemy who walks across them.
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Sending a Murder towards an enemy has a dual effect - it will both immobilise that enemy, and will also cause damage over a time period. This allows you to get in close and easily dispatch an enemy with a well timed shotgun blast or other, more creative kills.
Here's a handy little tip for you: make sure you equip both the Murder of Crows and Devil's Kiss/Shock Jockey Vigors. Once you've done this, lob a Murder towards an enemy, switch to Devil's Kiss/Shock Jockey and enjoy the effects.
Flaming/Electric Murder of Crows is better than bog-standard Murder of Crows, right?
This combination is also part of the requirement to unlock the trophy/achievement Combination Shock.
|Veni Vidi Vigor|
|Murder of Crows Vigor|
|Crow Trap Aid||$1485|
|Max Upgrade Cost|| $2030|