Something I've noticed about RuneLite is that the reward potential percentage color for the Barrows plugin changes at certain thresholds. Digging into the source code, the line that does this is this one:
.rightColor(rewardPercent >= 73.0f && rewardPercent <= 88.0f ? Color.GREEN : rewardPercent < 65.6f ? Color.WHITE : Color.YELLOW)
This line sets the completion percentage color to white below 65.6%, yellow between 65.6% and 73%, green between 73% and 88%, and yellow again above 88%. What, in particular, is different about this particular range, and how does this percentage factor into the loot roll?
Best Answer
After doing a bit more research on the barrows wiki page. It states that:
So this accounts for the max of 88%. But what about the 73%? Well, further down the page it states that the roll for blood runes:
So 73-88 is essentially the best range to have to get the max amount of mind, chaos, and death runes, while also still guaranteeing a roll for potential blood runes. At 88%, you can receive the max amount of runes possible (if you are so lucky). After 88% (exactly 881 potential) you will roll for bolt racks and lose a potential reward slot for runes.
Just as a quick guide, these are the potentials needed to roll for each rune/bolt drop.
Note: The chance for a piece of barrows equipment is "unaffected by the rewards potential that is built by killing other monsters in the crypt."