Someone

#define MY_LUA_FUNCS
[lua]
    code = << 
beastGoldValues= {3, 5, 10, 15, 25, 50, 100, 200}

function beastDie(event)
	local event_data = wesnoth.current.event_context
	local side=event_data.unit.side
	local sideGold = wesnoth.get_side(side).gold
	sideGold = sideGold + beastGoldValues[event_data.secondUnit.level]
	wesnoth.float_label(event_data.x2, event_data.y2, "<span color='#ff0000'>MONEY!</span>")
end
 >>
[/lua]
#enddef


... elsewhere...

[event]
	name=die
	first_time_only=no
	[filter]
		side=5
	[/filter]
	[sound]
		name=gold.ogg
	[/sound]
 	[lua]
		code = << beastDie() >>
	[/lua]
[/event]