(Melee Only) - (recipe currently double regen items + long sword + pickaxe but subject to change)
+50 Attack Damage
+15 Health Regen per 5 seconds
UNIQUE Passive – Cleave: Your attacks deal up to 60% of your Attack Damage to units around your target – decaying down to 20% near the edge.
(Basically, around old Tiamat range you get 60% damage. 100 units past old Tiamat range, you get 40% damage and 200 units past old Tiamat range, you get 20% damage.)
(It currently does not work with critical strikes - it only inherits your base attack damage.) (It has a short internal cooldown of 0.05 seconds on different targets. You are free to trigger them as quickly as possible on the same target)
UNIQUE Active – Crescent: Deals up to 100% of your Attack Damage to units around you – decaying down to 60% near the edge – 10 second cooldown.
(The Active Cleave is even larger than the passive cleave - and gets to about 400 units.)
The underlined portion means that her Q will hit one target twice as intended BUT she can't hit multiple targets with the Tiamat simultaneously.
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The niche abuse case of stacking Tiamats for gimick one-shot multikills is still an abuse case, and Riot wants it gone in favor of making the item more generally viable.