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npc > script_custom.conf

// -- Warper that works only after locations are unlocked
//npc: npc/custom/etc/quest_warper.txt

I think it used for receive/not receive parter call (The one who married)

Try go to data\luafiles514\lua files\datainfo\TB_Layer_Priority.lub and edit your costume layer priority.
*Not sure it's correct file to edit or not.

\rathena\src\map\battle.cpp 
Line 1477
You will see SC_END, try add some variable like endure hit count then it should be fine.

I found it now.
Location: data\texture\À¯ÀúÀÎÅÍÆäÀ̽º\basic_interface\collection_bg.bmp
or
\skin\default\basic_interface

Patch '19 Enable Title Bar Menu'.

\rathena\conf\battle\player.conf
 
Change weight percent to 99 or 100

source edit.
Try search in src folder like 'RODEX, mail'
and find when to open/claim mail just check jobs.

Please revert all code modified and use this instead.
\src\map\mob.cpp  Line 2212
if( test_autoloot && (itemdb_dropeffect(ditem->item_data.nameid) <= 0)) { //Autoloot.

Oh I thought you said 127.0.0.1 was work but it wasn't. (Login and enter game)
Then it's client side now.
Can you try this please?
<?xml version="1.0" encoding="euc-kr" ?> <clientinfo> <desc>Ragnarok Client Information</desc> <servicetype>thai</servicetype> <servertype>primary</servertype> <connection> <display>TEST</display> <address>127.0.0.1</address> <port>6900</port> <version>55</version> <langtype>5</langtype> <registrationweb></registrationweb> <loading> <image>loading00.jpg</image> <image>loading01.jpg</image> <image>loading02.jpg</image> <image>loading03.jpg</image> <image>loading04.jpg</image> <image>loading05.jpg</image> <image>loading06.jpg</image> </loading> </connection> </clientinfo>  
 
If still not working. Please use client date 20211103 as rAthena standard client date.

data/msgstringtable.txt (Search some wordings, you will found it)
If it doesn't exist. Please learn how to use GRF Editor then extract it from .grf

Some bonuses check equip location.
Go to \src\map\pc.cpp then find target bonus and change sd->state.lr_flag to your desire. (Hover at it you will see tooltip)

Hi this is how fo fix.
 
You need to increase MAX_SKILL in src.
 
--------------------------
 
\db\import\skill_db.yml
Header:   Type: SKILL_DB   Version: 3 Body:   - Id: 5000     Name: SM_SWORD_CUSTOM     Description: Sword Mastery Custom     MaxLevel: 10     Type: Weapon \db\import\skill_tree.yml
Header:   Type: SKILL_TREE_DB   Version: 1 Body:   - Job: Novice     Tree:       - Name: SM_SWORD_CUSTOM         MaxLevel: 9 \src\map\skill.hpp
    SM_SWORD_CUSTOM = 5000,
    
\src\common\mmo.hpp
#define MAX_SKILL 1455 ///Maximum skill can be hold by Player, Homunculus, & Mercenary (skill list) AND skill_db limit \data\luafiles514\lua files\skillinfoz\skilldescript.lub
[SKID.SM_SWORD_CUSTOM] = {         "Hello World"     },
\data\luafiles514\lua files\skillinfoz\skillid.lub
    SM_SWORD_CUSTOM = 5000,
\data\luafiles514\lua files\skillinfoz\skillinfolist.lub
    [SKID.SM_SWORD_CUSTOM] = {         "SM_SWORD",         SkillName = "Sword Mastery Custom",         MaxLv = 10,         SpAmount = { 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 },         bSeperateLv = false,         AttackRange = { 1, 1, 1, 1, 1, 1, 1, 1, 1, 1 }     },
\data\luafiles514\lua files\skillinfoz\skilltreeview.lub
    [JOBID.JT_NOVICE] = {         [0] = SKID.NV_BASIC,         [1] = SKID.SM_SWORD_CUSTOM,         [7] = SKID.NV_FIRSTAID,         [14] = SKID.NV_TRICKDEAD     },
\data\luafiles514\lua files\skillinfoz\skilltreeview_web.lub
    NOVICE = {         [0] = SKID.NV_BASIC,         [1] = SKID.SM_SWORD_CUSTOM,         [7] = SKID.NV_FIRSTAID,         [14] = SKID.NV_TRICKDEAD     },  

\rathena\doc\script_commands.txt
Line 9033 (setchar)

Try reset factory by opensetup.exe

See nodeadbranch mapflag in npc folder.

Go to '\conf\channels.conf' and adjust settings.

Use barter shop system.

Leave an error pop in message box if it won't crash the game.
But if there are error dialog pop, you need to use client date that can patch 'Ignore error' to prevent error dialog pop. So player can play along without game freezing.

2021-11-17 work fine for me.
Remember to pull latest commits from rAthena then clean and build project again.

Fix still in process, it will get merge into master branch soon.

use
atcommand "@commands" in your commands2

2021-12-13 17-08-18.mp4    
Work fine on my end.

2021-12-13 17-08-18.mp4    
Work fine on my end.

Set it on db/re/item_no_equip