Thunder Wyvern

[Budesca]

Hello everyone,

I have been killing thunder wyrm (https://l2db.club/?show=npc_info&id=20243, https://l2db.club/?show=npc_info&id=20282)

The mob drops 5 parts of weapon at 1/200 chance. So the chance that a mob doesnt drop any its (199/200)^5 (something like 97'52 %) 

Yesterday and today I have been killing this "lovely" wyrm and I get 0 keys. I killed more than 120, when they should drop a key every 40 wyrms (on average, you know ramdomness can be luck/badluck). But the chance of not getting any key on 120 mobs is 5%, which means at 95% you should get at least one key. 

Dunno if it's something wrong with my pony, the way I kill, the rng that hates me or God wanna make me suffer (except the day I killed three salamander and two of them droped me a mid D weapon, wtf(?)) but I feel like something is not working, maybe because I do not understand the mechanics of the "randomness". 

Can you help me to solve this mistery?

Thank you for your work and the great server.  

 

PD: My sumoner is 53 and mobs are 54 lvl

Edited February 19, 2023 by Budesca

[Budesca]

Today I got 1 part over 180 Thunder wyrm. (expected 4'5 parts) The part droped on the wyrm nº 57.

Edited February 21, 2023 by Budesca

[Krasas]

So everything seems okey. It has group chance, that means that is still 1/200 for a part drop. (Any part, doesnt matter that it drops 5 of them, the chance is still 1/200.