Patch 13.3 overview
Champions you recently played
No change
Other Champions
Q mana cost increased. E base damage decreased.
Passive is now fully charged on spawn. E shield strength increased, cooldown decreased, retaliation damage and conditions adjusted. R Tibbers health, armor, magic resist, and movement speed increased.
CGU, abilities adjusted.
Base armor increased, W cooldown decreased, shield strength now scales with AD, shield duration decreased.
Base health increased. Q knockup and stun duration decreased. W minimum stun duration decreased. R bonus resistances lost increased.
E base damage decreased, cooldown reduction from nearby casts decreased. R base damage decreased, bonus damage per stack decreased.
Passive bonus move speed increased. E on-hit AP scaling increased, missing health damage increased.
Passive Shadow Assassin damage increased. Q AD scaling increased.
Mana Regeneration and Mana Regeneration growth increased. Q mana cost now flat at all ranks. R cooldown decreased early.
Q AD ratio increased. E base damage decreased, slow increased.
W cooldown decreased at all ranks. Discovered his passion for dancing.
W AP scaling decreased. E AP scaling decreased.
Items you recently played
No change
Other items

Radiant Virtue
Radiant Virtue is currently overpowered (even if pickrate isn't reflecting it) yet its strength isn’t really appreciable due to how unclear the item's best points are (because when you buy a strong item, you should feel strong). We're making Radiant Virtue’s upsides more apparent and impactful while removing some of the extraneous power that is pushing this item a bit too far. We feel enchanters already have plenty of defensive support options, while Radiant Virtue is meant for selfless tanks, who have fewer. So we’re tying Radiant's value more directly tied to tanks with the budget to acquire even more health.

Umbral Glaive
Umbral Glaive is currently much too effective at choking out enemy vision for assassins, supports, assassin supports, and especially marksman supports (stop killing my defenseless wards, Ashe). We do think this item deserves a spot on the roster though, so we’re reducing its uptime and general ability to devastate enemy traps and vision.
Runes you recently played
No change
Other runes

Overheal
Overheal changes were intended to ship with 13.2, but because we only micropatched with 13.1b this change was held back until now. Overheal is stronger for everyone and especially stronger for marksmen because the rune is weak and because players can hopefully opt into running it in games where they need that extra durability.