On the topic of crazy items, let's remember that BG2 had a bunch of belts that set strength from 19 to 22 (or was it 23?) and a hammer that set strength to 25 and a pair of gloves that set dex to 18 and a ring obtained within minutes of leaving the tutorial dungeon that set charisma to 18. Also a fancy staff that gave invisibility to the wielder, a cloak that dumped offensive targeted spells right back at the caster, a shield that reflected arrows back at the caster, and a +3 flail with three additional elemental damage rolls and slow. Oh, and a mace of disruption that gave immunity to vampire fuckery and caused save or die for all undead, and a special anti-undead +4 sword with a once per rest AoE save or die spell.
If there's only a mere 9 legendary items in the game then I'm thinking Larian probably toned it down a notch.