Emistry

setarray .combinedArray[getarraysize(.combinedArray)], .attr1, getarraysize(.attr1); setarray .combinedArray[getarraysize(.combinedArray)], .attr2, getarraysize(.attr2); setarray .combinedArray[getarraysize(.combinedArray)], .attr3, getarraysize(.attr3); setarray .combinedArray[getarraysize(.combinedArray)], .attr4, getarraysize(.attr4); setarray .combinedArray[getarraysize(.combinedArray)], .attr5, getarraysize(.attr5); setarray .combinedArray[getarraysize(.combinedArray)], .attr6, getarraysize(.attr6);  

its probably better to wait or use this PR
https://github.com/rathena/rathena/pull/6304
all the plagiarism npc out there enabled stalker class to learn up to 2 skills instead of 1 skill only.

conf/battle/feature.conf#L143-L148
// Itemlink System on informational related commands (Note 1) // Generates an itemlink string for an item and can be used for npctalk, message, // dispbottom, and broadcast commands. The result is clickable-item name just // like from SHIFT+Click from player's inventory/cart/equipment window. // Requires: 2015-11-04Ragexe or later feature.itemlink: on  

- script sample -1,{ OnMinute00: OnMinute30: .@size = getmapunits(BL_PC, "ordeal_a02", .@gid); for (.@i = 0; .@i < .@size; .@i++) { if (unitexists(.@gid[.@i])) unitkill .@gid[.@i]; } end; }  

db/pre-re/job_exp.yml
you meant adjusting the exp required for each level ?

.@enter$ change to
.enter$  

try add
#include "mapreg.hpp"  

.@aid = convertpcinfo(.players[.@i],CPC_ACCOUNT); getitem .item_win, .count_win, .@aid;  

SELECT * FROM rush_mvp WHERE `char_id` = '"+getcharid(0)+"'", .@CharID change to
SELECT `char_id` FROM rush_mvp WHERE `char_id` = '"+getcharid(0)+"'", .@CharID or whatever that field was named for char id

just find 
dispbottom "You earned 1 Arena Points"; and change it to
dispbottom "You earned 1 Arena Point. Total "+F_InsertComma(arenapoint)+" Points"; same goes for other arena points display message.

you can disable the SECURE_NPCTIMEOUT
or
add this to your warper npc
*ignoretimeout <flag>{,<char_id>}; Disables the SECURE_NPCTIMEOUT function on the character invoking the script, or by the given character ID/character name. Valid flag: 0 - Enabled SECURE_NPCTIMEOUT. 1 - Disable SECURE_NPCTIMEOUT. Note: SECURE_NPCTIMEOUT must be enabled for this to work.  

stop the current script execution or wait until it reached destination only to trigger next unitwalk 

in the mob_dead(...)
search for 
drop_rate = mob_getdroprate(src, md->db, md->db->dropitem[i].rate, drop_modifier); replace with
if (it->type == IT_CARD) drop_rate = md->db->dropitem[i].rate; else drop_rate = mob_getdroprate(src, md->db, md->db->dropitem[i].rate, drop_modifier); hmm... nvm this actually removed all modifier.
 
 
it probably better if you pass the item type into 
drop_rate = mob_getdroprate(src, md->db, md->db->dropitem[i].rate, drop_modifier, it); then
int mob_getdroprate(struct block_list *src, std::shared_ptr<s_mob_db> mob, int base_rate, int drop_modifier,struct item_data it) then add the item type checking to skip if its card and is vip
if (pc_isvip(sd) && it->type != IT_CARD) { // Increase item drop rate for VIP.  

you can't, perhaps just consider use a newer client that lifted this limit.

npc/custom/etc/floating_rates.txt
remove the drop rate modifier
change the trigger time

that is because you call the function without pass in any parameters/arguments or set a defeault value for each of getarg(...)
getarg(0, "default_value") function script SC_MOVEARM { movenpc getarg(0, strnpcinfo(3)),rand(2,390),rand(2,390); getmapxy(.@map$,.@x,.@y, BL_NPC,getarg(0, strnpcinfo(3))); if( !checkcell(.@map$,.@x,.@y,cell_chkreach) ){ return 0; } if( !checkcell(.@map$,.@x,.@y,cell_chkpass) ){ return 0; } return 1; }  
but as sader mentioned, your label with SC_MOVEARM name isn't suitable, you shouldn't name any label start with SC_ since its predefined for status change constants.
and learn to use duplicate(...) npc instead of copy all npcs like that

- script atcmd_example -1,{ OnInit: bindatcmd "reset",strnpcinfo(3) + "::OnAtcommand"; end; OnAtcommand: query_sql("DELETE FROM `char_reg_num` WHERE `key` LIKE 'Mission%'"); query_sql("DELETE FROM `acc_reg_num` WHERE `key` LIKE 'Mission%'"); .quest_count = getvariableofnpc(.Quests, "Hunting Missions"); addrid(0); #Mission_Count = 0; #Mission_Delay = 0; #Mission_Total = 0; @hm_char_del_check = 0; for (.@i = 0; .@i < .quest_count; .@i++) { setd "Mission" + .@i, 0; setd "Mission" + .@i+"_", 0; } dispbottom "A GM has forced reset your Hunting mission status."; end; }  

- script WorldBoss::alwbman -1 ,{ end; OnNPCKillEvent: .wbKilledMob++; if(.wbKilledMob >= .killPopBoss) { .@map$ = .townMap$[rand(getarraysize(.townMap$) - 1)]; areamonster .@map$, 0, 0, 250, 250, "--ja--", .wBossId, 1, strnpcinfo(3) + "::OnWBossDied"; .boss_gid = $@mobid[0]; initnpctimer; announce "[Chefe do Mundo]: Humanos tolos, como ousam me despertar? Voc阺 ir鉶 sentir a minha ira!", bc_all, 0xFF0000; sleep 10000; announce "[Chefe do Mundo]: Muahahahahahaha Muahahahahahaha Muahahahahahaha...", bc_all, 0xFF0000; sleep 10000; announce "[Chefe do Mundo]: O Chefe do Mundo surgiu em >> " + .@map$ + " << para matar todos os aventureiros que o despertaram!", bc_all, 0xFF0000; } end; OnWBossDied: announce "[Chefe do Mundo]: " + strcharinfo(0) + " acerta o golpe final e acaba de matar o Chefe do Mundo! Parab閚s!", bc_all, 0xFF0000; sleep 5000; announce "[Chefe do Mundo]: " + strcharinfo(0) + " acaba de receber uma grande recompensa por det?lo!", bc_all, 0xFF0000; sleep 5000; announce "[Chefe do Mundo]: N鉶 fique contente humano eu retornarei um dia!", bc_all, 0xFF0000; getitem .rewardId, .rewardCount; OnTimer7200000: // after 2 hours stopnpctimer; .wbKilledMob = 0; if (unitexists(.boss_gid)) unitkill .boss_gid; end; OnInit: .killPopBoss = 10; setarray .townMap$[0],"prontera","geffen","morocc","payon","izlude","alberta","aldebaran","brasilis","dewata"; //to fill .wBossId = 2255; .rewardId = 14232; .rewardCount = 5; end; }  

try disable SECURE_NPCTIMEOUT
or add this to your warper script
*ignoretimeout <flag>{,<char_id>}; Disables the SECURE_NPCTIMEOUT function on the character invoking the script, or by the given character ID/character name. Valid flag: 0 - Enabled SECURE_NPCTIMEOUT. 1 - Disable SECURE_NPCTIMEOUT. Note: SECURE_NPCTIMEOUT must be enabled for this to work.  

L_Enter: mes "Please pay me one "+getitemname(7227); if (select("Alright", "Cancel") == 2) close3; if (countitem(7227) < 1) { mes "You dont have enough "+getitemname(7227); close3; } switch(instance_enter("Endless Tower")) { case IE_OTHER: mes "An unknown error has occurred."; close; case IE_NOINSTANCE: mes "The memorial dungeon Endless Tower does not exist."; mes "The party leader did not generate the dungeon yet."; close; case IE_NOMEMBER: mes "You can enter the dungeon after making the party."; close; case IE_OK: delitem 7227, 1; mapannounce "e_tower", strcharinfo(0) +" of the party, "+ getpartyname( getcharid(1) ) +", is entering the dungeon, Endless Tower.",bc_map,"0x00ff99",FW_NORMAL,12; if (getarg(1)) { set etower_timer,gettimetick(2); set etower_partyid, getcharid(1); setquest 60200; setquest 60201; } //warp "1@tower",52,354; if (getarg(0) == 0) close; else end; } npc/instances/EndlessTower.txt#L295

it was added to ensure character will auto disconnect after it reached the time limit.
if you dont need it, might as well just remove the whole block of codes.
if( battle_config.at_timeout ) { int timeout = atoi(message); status_change_start(NULL,&sd->bl, SC_AUTOTRADE, 10000, 0, 0, 0, 0, ((timeout > 0) ? min(timeout,battle_config.at_timeout) : battle_config.at_timeout) * 60000, 0); } or just disable the at_timeout settings as mentioned previously.

- script KillMon2Cash -1,{ OnNPCKillEvent: .@gettimetick = gettimetick(2); if (rand(100) < 1 && .@gettimetick > @delay) { getitem 50001,1; @delay = .@gettimetick + 60; // 60 seconds } end; }  

your fluxcp is too old , use a newer version of fluxcp
https://github.com/rathena/FluxCP

input .@item_id; .@size = query_sql("SELECT char_id, nameid, amount FROM `inventory` HAVING nameid = "+.@item_id+" ORDER BY amount DESC LIMIT 3",.@charid,.@nameid,.@amnt); for (.@i = 0; .@i < .@size; .@i++) dispbottom .@charid[.@i]+" : "+getitemname(.@nameid[.@i])+" "+.@amnt[.@i]+"pcs"; end;  

switch(select("^000088Visit Shop^000000", "Information")){ case 1: switch(select("^000088Use Event Points^000000", "Use Event Coins")){ case 1: close; callshop "eventpoints",1; end; case 2: close; callshop "eventpoints",1; end; } break; case 2: switch(select("^000088Castle Drops^000000","Cards","Cancel")){ case 1: callshop "eventcastle",1; end; case 2: callshop "eventcards",1; end; } break; } your usage of switch() and select() isn't correct