I think it depends on why you all meet for the first time.

You’ve all seen an “adventurers wanted” poster, gone to the listed address, passed the interview, and been hired? Fine.

You all randomly meet in a tavern, hear a rumor from one of the locals, and decide to work together with complete strangers? Stupid.

You’re all agents of the authoritarian wizard king “Friend Wizard”, assigned to enforce their authority. You’re also all members of different prohibited secret societies with secret missions to steal from & sabotage Friend Wizard. If you die Friend Wizard will resurrect you, the first 6 resurrections are free and more 6-packs can be purchased. Your DM is running Paranoia in D&D, wacky hijinks will ensue. Silly.

Pretty much how I DM.

Bosses have prep time. Glyph of warding can be cast on a page in a book, with trigger conditions specified by the caster. E.g. when a good-aligned creature with ≥8 int comes within 10ft of it.

Explosive runes are 5d8 damage (dex save for half) per glyph.

Nothing says it can’t be cast on more than one page.

A 50 page book with a glyph on every page means 100 dex saves for 5d8 each. Evasion is nice but you’ll fail a save eventually.

Your “friendly” neighborhood lich has had time to prepare dozens of these. That tempting library full of magical books might just be a TPK.

As a “consolation prize” at least the player gets to roll 100 d20s at once! Multiple times if they survive the first book.