List of Internal Variables and Its Java-Docs

Work on Most Triggers

Variables	Link
event	[Child of Event] -- Any event that has activated the trigger. #CANCELEVENT is in fact same as event.setCancelled(true)
vault	VaultSupport
mcmmo	McMmoSupport
placeholder	PlaceHolderSupport
factions	FactionsSupport
coreprotect	CoreprotectSupport
protocollib	ProtocolLibSupport
worldguard	WorldGuardSupport
player	Player

Click Trigger

Variables	Link
block	Block
item	ItemStack

Walk Trigger

Variables	Link
from	SimpleLocation
to	SimpleLocation

Command Trigger

Variables	Link
command	String -- it's the actual command string
args	Array(of String) -- the arguments that the player have entered. args[0] for first argument, args[1] for second, ...
argslength	Number -- number of argumenets. Equivalent to args.length

Sign Trigger

Variables	Link
block	Block
item	ItemStack

Inventory Trigger

Variables	Link
inventory	Inventory
item	ItemStack
slot	Number -- Clicked slot number
trigger	String -- indicates what event activated this trigger. (open, click, and close)

Repeat Trigger

Variables	Link
trigger	String -- indicates what event activated this trigger. (init, repeat, and stop)