First video is original effect. I used it loooong time ago on custom weapons, but now, I don't facking remember which weapon uses that effect.. :D
Ice Fairy' perhaps?
Reactions should NOT influence the reputation system and true, ONLY the author of the topic should get reputation. Possibility to give karma/rep to any post, it's a crap. Else allow it for certain sections, like helping topics - sure thing, someone give a solution and boom, you can 'reward' him with reputation. That's legit.
Not sure if that's the issue, could be, but you have to use 2 times for loop. One loop as a condition - your checks - and then second loop, if everything is okay, teleport. Also, dunno if you noticed but you teleport, try to, only the player - test purposes, perhaps :P
Toi angels works like that. You kill monster x, and angel appears, simply do the same stuff and add chance.
https://xp-dev.com/svn/aCis_public/aCis_gameserver/java/net/sf/l2j/gameserver/scripting/scripts/ai/group/PolymorphingAngel.java
Hard to tell, as you, as a user, you accept their JavaScript :p
TPB did the same https://torrentfreak.com/the-pirate-bay-website-runs-a-cryptocurrency-miner-170916/
As mentioned above, thing is.. People don't really want to farm, they want pew pew and then.. they get bored. One way or another, you can't really satisfy them.