The bestiary

Journal → Bestiary from the title screen lists every monster that drops loot, by level, for the whole account. A monster your heroes never met is a ???. Once met, tap it to see:

• What it is where you last met it: its level, life, damage and resistances in that dungeon and floor. Monsters grow with depth and difficulty, never with you (see Dungeons), so the same Hollow Squire is a different fight on Hell's floor 60.
• Its skills and the regions it lives in.
• Your record: how many times you met it and killed it, and how many heroes it killed, by rank, with the mods of the last champion or elite that did. The They killed you filter lists only those.
• Its drops per kill there, as a common monster, champion and elite: the chance of a magic, rare, set and unique item, the same odds as Drop odds, without magic find.