Hi manabeast,
I believe it's suppose to be 'SL_KAIZEL'.
Source: https://rathena.svn.sourceforge.net/svnroot/rathena/trunk/db/re/skill_db.txt
Ctrl+F, search for 'kaizel'.
462,9,6,16,0,0x1,0,7,1,yes,0,0,0,magic,0, SL_KAIZEL,Kaizel
Also, I would recommend putting that entry into 'item_db2'; so you can later upgrade your item_db with newer entries without having any problems with your custom items.