Empowered healing, shielding, and lane pressure.
Durability and crowd control
Guard allies you cast spells on and those that are very nearby. If you or a guarded ally would take damage, you're both hasted and granted a shield.
Charge up a powerful attack against a tower while near it.
After taking damage from an enemy champion, the next 3 spells or attacks you receive deal less damage.
Heals and shields are 5% stronger and increased by an additional 10% on targets below 40% health.
Creative tools and rule bending
Get a free biscuit every 3 minutes, until 12 minutes. Biscuits heal and permanently increase your max mana.
+5% Max CDR
+5% Summoner Spell CDR
+5% Item CDR
+5 AD or 9 AP
+6 Armor or 8 MR (match-up)
Guardian is especially powerful on Yuumi thanks to your constant close proximity to teammates while attached with [W].
Demolish is an ideal rune choice for early game tower plate leads where you're able to pressure the enemy out of lane.
Yuumi has incredibly low base health so all forms of damage mitigation help immensely in keeping you alive.
Yuumi provides a considerable amount of shielding and healing from her passive, [E], and redemption combined with the burst shield from Guardian.
Biscuit Delivery further empowers your ability to sustain and bully in lane for early game tower plate gold.
Cosmic Insight's general utility is perfect for