weird item level restrictions
wands and potions of berserk rage that can get picked up by monsters
Requires item level 3+
artefacts, except for unrandart staves
Requires item level 4+
scrolls of vulnerability, summoning, acquirement, silence, brand weapon, torment, holy word
Requires item level 7+
demon blade, demon trident, demon whip, double sword, eveningstar, executioner's axe, manuals, quick blade, triple crossbow, triple sword
Requires item level 8+
miscellaneous items
Seemingly intended to require item level 7+ but doesn't
fustibalus, lajatang
Ok but why are these weird?
Vaults place items with item levels higher than their depth (yes there are even D:1 vaults do this) so these don't actually stop artefacts and stuff from generating on D:1 they just cause weird breakpoints in item distribution and make it easier for spoiled players to identify scrolls. Yes you could still get a wand kobold or berserk gnoll on d:1 if it found the wand/potion in a vault with bonus item levels.