Subcommand 0x22: Damage
BYTE[1] unknown, always 1
BYTE[4] Serial
BYTE[1] Damage // how much damage was done ?

I have it hooked. Is it possible to do this effect with another color and with the number going down (not up)???

I tried to use graffic effect packet but it only accepts Objects ID.

Pretty sure this is hardwired in the client. All the packet hook does is tell the client to perform the preset function of displaying the info but the client determines the colour and direction of travel for the numbers. If I am wrong then someone can correct me.