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Feed The Beast Wiki
Constant: Wrapper

GroupFlow Control
Return typeNumber Constant
ConstantNumber Constant
Technical details
Registry nameconstantWrapper

Constant: Wrapper is a Number Constant Spell Piece added by Psi. It is used to allow a Trick Spell Piece to operate on a variable while using a constant as the value to calculate Psi cost (in other words, the maximum the variable can be). Mathematically, it can be expressed as:

where is any number, and is the assigned constant.

It is unlocked in the lesson "Flow Control."


  • Target: Requires a number. When using this Spell Piece this is commonly a variable.
  • Constant: Requires a number constant. It essentially sets the Psi cost of the spell and the maximum of the Target parameter.


"name" = ""Navbox Psi"" "state" = ""plain""