It's in your DB. load up heidisql and click the peq db and find the server rules table. you don't need to know sql or DB's at all -- gui, point and click, read and type all you need to know how to do for this stuff. it may ask for user name and password -- simply use the same one you've setup for eqemu -- if not sure it's the default stuff in the wiki and numerous other help pages (l:peq p:eqemu i think?). either way set it should be local only for safety with those default passwords, lol.
this link may have additional descriptions or may just mirror what you see. a few things are not 100% intuitive, but within 1-2 guesses you should figure it out with trial and error. it's intuitive once you have the proper perspective on it, of course.
https://github.com/EQEmu/Server/wiki/Server-Rules
if they don't exist in your db, you can add them. match case / copy/paste it etc... i think they are auto-added nowadays, but just in case.... also there's an option in the eqemu maintenance script to remove duplicates, if needed. (the main script for updating code, db, etc... i don't know exact name by rote)
what you are looking for is in the "Character" portion.. sorting for this field will help organize what you see better, if not already sorted that way. don't be afriad to sort or apply a filter of any kind... that doesn't 'change' anything in a db...
DO becareful of any edits.. they are final and immediate once run. for this sort of thing, you're just selecting an input box and changing a value, so it's simple stuff. you may need to press the run button (looks like aplay button) or the changes could be immediate depending on settings. it will warn you if you try to exit without processing your changes.
DeathItemLossLevel
is one of rules you are looking for.
there's no undo button in DB's, so just take your time... use the backup feature before doing anything crazy.
i also backup my rules table occasionally.. simply export it as sql file or csv etc.. for later import when needed.
every chang ei make i catalog and save the bits that made it so... that way if i have to re-install the server for any reason i can simply run my sql files and re-insert table data without concern of missing something.