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lugiore

Randomness Of Drops

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hi all,

 

i wonder if anyone is able to tell me how a drop is calculated when you kill a mob,

 

for eg. is it just a random drop with no % of a certain item dropping or dose it have a chance % of a particular drop from occuring, like 3% a cape will drop or a 10% a pgp will drop etc

 

i hope someone can help me with this, as i never actually thought about it before.

 

Thankyou for your time

 

 

lugiore

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Depending on the item (primary or secondary drop), about 3 to 5 dices are rolled, and you must be lucky every time to get the item.

 

Let's take secondary drops (= rare drops) as an example (please note that ALL numbers I use in this example are just for the example, they're nowhere near the real values).

Let's say a slime can drop a xelima rapier and SB as secondary drop, then to get it, you need to pass 5 dice rolls with success.

 

1st dice roll is easy: 1 dice of 2 eyes is rolled -> 2 eyes because there is 1 body part and 1 chance for secondary drop, so a dice is rolled to decide if you get a chance for body part or for rare item. Generally this dice can be determined easly: # of body parts +1.

 

2nd dice (if first was rolled for rare drop ofc !) -> Global Rarity: a dice with X eyes is rolled -> 100 eyes (fake value), this value can be altered by winning apocalypse (gain 9% bonus) and an additional 9% if killing in ML. You only have 1 chance to pass this dice, let's say you must roll value 50. So the dice is rolled (random number between 1 and 100 is generatred), if you roll 50, you can move on to step 3, otherwise you don't get anything. (permanently hidden value, never released in public)

 

3rd dice (if 2nd was rolled with success ofc !) -> Monster Rarity: a dice with X eyes is rolled -> 500 eyes (fake value), this value is monster specific and cannot be altered by anything, it's always the same, but different for each monster. You have only 1 chance, let's say value 100 must be rolled. So the dice is rolled (random number between 1 and 500 is generated), if you roll 100, you can move on to step 4, otherwise you don't get anything. (permanently hidden value, never released in public)

 

4th dice (if the 3rd was rolled with success ofc !) -> Item Chance: a dice of X eyes is rolled -> 2 eyes (for the example only XR and SB are dropped, so it's 2 items -> 2 eyes), this value is monster specific, it's always the same and cannot be altered by anything. Generally this value can be calculated too, it is always equal to the number of rare items a monster can drop. (in case of only 1 drop, this dice is a 100% success and can be removed in the final calculation of item drop rate as multiply by 1 keeps the same value)

 

5th dice (if 4th was rolled with success ofc !) -> Item Rarity: a dice with X eyes is rolled -> 200 eyes (fake value), this value is item AND monster specific and cannot be altered by anything, it's always the same, but different for each item on each monster (SB from nizie or SB from frost has different item rarity as nizie is harder to kill than frost). You have only 1 chance, let's say value 50 must be rolled. So the dice is rolled (random number between 1 and 200 is generated), if you roll 50, you finally get the item dropped on the floor, otherwise you don't get anything. (permanently hidden value, never released in public)

 

To calcualte the item's total rarity, you must count these 4 values together in the next way:

chance of value 1 * chance of value 2 * chance of value 3 * chance of value 5

 

As all of them only have 1 chance to pass, you can simply multiply the number of eyes:

2 * 100 * 500 * 2 * 200 = 40000000 (40 mil)

 

So, in the end you can say your chance is 1 in 40 mil or a 0,0000025% drop chance for the getting specifically xelima rapier from a slime (as used in the example.)

Usually the drop chance on average is 1 in 200k ~ 1 in 4 mil, depending on the item and monster ofc.

 

Please note that this drop calculation does NOT apply to the next mobs:

Tigerworm, Hellclaw, Wyvern, Fire Wyvern, all Dragons and Abaddon.

 

For primary drop rates (applied to ALL monsters) a slightly different drop sequence is used, usually there are also 4 to 5 dices rolled before an actual item is dropped.

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Thank-you White, that explained everything i wanted to know.

 

 

Pro GM :D

 

you're welcome :)

 

Just to clearify some more thing:

If a server announce "rare drop rate x5" it is secondary drop rate, and it is only dice 2 that is devided by 5 (= increase -> from the example: 100 / 5 = 20 -> 1 chance in 20 is better than 1 chance in 100, drop rates are announced as multiplied by, but code-wise it is always devided by)

If servers announce "drop rate x25" it mostly is primary drop rate, and only dice 1 and 2 are devided by 25 (= increase).

 

Most servers never devide the monster or item drop rates themselfs, your chance increases but it's mostly a misleading value. Same on primary drop rate, there is an increase, but they don't increase the chance of getting a high statted rare, the chance to get 91% is still the same in most servers.

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Can i ask how the drop for tw hc etc is differeent?

 

ty for the extra info aswell

 

They don't have body parts, so they get 100% chance for 2nd drop, resulting in dice 1 not to make a difference (0 body parts + 1 = 1).

The 2nd, 3rd, 4th and 5th side are never rolled.

If it's a HC or TW, there is 1 dice rolled of 35k eyes (fake value), each range of values (1~2500, 2501~4000, ... 34999~35000) defined a specific drop, where the large ranges are covering the low level drops (ring of wizard etc) and the very small ranges cover the merien shield or xelima blade etc... (the rarer items).

 

for abby, wyverns and dragons there is a completely different mechnism cuz they have multi-drops and not just one item.

That mechanism works as following:

3 dices are rolled, they're called probability A, B and C. Each of these large mobs have items in the 3 categories, where C (third category) is shared and contains common items like zems, stones, gold, flameberge, ruby ring etc... category A (rarest items) and B (less rare items) are individual for each mob.

If you're lucky enough you get an itme from category A, if less lucky it'll be B, if unlucky it'll be C, if not lucky at all, you'll get just gold.

Nemesis has the restriction that only 1 item of category A can be dropped and 2 of category B, so if you rolled 2 with success 2 times dice A, you only get 1 item, the 2nd item will be from category B, unless you got already 2 items of category B, then it'll drop an item of category C.

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Awesome info,

 

So dose that mean that you can possiblely get a ( in the abbh wyvn dragons case ) potentionally a drop from category A, 2 drops from category B and 1 from category C?

 

Or is the resriction that only 1 from category A and 2 from category B is the maxium?

 

 

 

sorry to ask

Edited by lugiore

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Awesome info,

 

So dose that mean that you can possiblely get a ( in the abbh wyvn dragons case ) potentionally a drop from category A, 2 drops from category B and 1 from category C?

 

Or is the resriction that only 1 from category A and 2 from category B is the maxium?

 

 

 

sorry to ask

 

it's possible to get 1 drop form A, 2 from B and x more from C, that possibility exists. Abaddon drops about 10 items, so it sure is possible that this situation occurs.

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