Variables start with $ , eg. $HIT and $ATTACKS

Some of the built-in functions are RANDOM(), TOOL() and ITEM().

[ARROW] is a tag - it refers to any item which has been tagged as an arrow.

The value of $PARAM.TARGET is expected to be defined by the previous action, which triggers "attack_ranged" - currently that happens in an interactive hunting story. (Stories are moddable as well, and pretty much any action can be defined to spawn a "choose your action"-style mini text adventure)