Clue scroll (elite)/Drop list

Elite clue scrolls may also be obtained from:
 * Barbarian Assault high-level gambles (1/15)
 * Dragon impling (1/50)
 * Barrows (1/200 per brother defeated; up to 1/33.3 when all are defeated)
 * Chambers of Xeric (if a player rolls the resource table, there is a 1/12 chance of the second resource slot being replaced with an elite clue instead of half the resources)