BOP N' BLOCK

Bop n' Block is a tremendous part of Yuumi's kit and is honestly so good that most Yuumi main's would recommend playing around it, it is a good shielding ability and it's mana gain which is increasingly important now that her heal costs 2 cars and is one of the few things that encourages unattaching .

PROWLING PROJECTILE

Yuumi fires a missile that deals, Lv.1 40 / Lv.2 65 / Lv.3 90 / Lv.3 115 / Lv.4 140 / Lv.5 165 (+30% of ability power) magic damage plus Lv.1 +3%/ Lv.2 +4%/ Lv.3 +5%/ Lv.4 +6%/ Lv.5 +7%/ Lv.6 +8% of target's current health as damage

If the missile is in flight/has been moving for 1 second, iLv.1 45/ Lv.2 80/ Lv.3 115/ Lv.4 150/ Lv.5 185/ Lv.6 220 (+40% of ability power) magic damage and applies a 20% slow to enemies for 1 second.

If Yuumi is Attached, she fires from her Ally and can control the missile for up to 2 seconds.

Mana Cost-Lv.1 90/ Lv.2 88/ Lv.3 86/ Lv.4 84/ Lv.5 82/ Lv.6 80

This is Yuumi's main damage it's a bit slow at first with it's damage output and depending on the build; just helps you trigger Manaflow Band at first, but in mid and late game it can be used as a slowing engine or something that chips a small bit of their health.

YOU AND ME!

Passive: While Attached, Yuumi and her ally share

Lv1 12 / Lv2 14 / Lv3 16 / Lv4 18 / Lv5 20 ( Lv1 +12% / Lv2 +14% / Lv3 +16% / Lv4 +18% /Lv5 +20%) adaptive force, granting each other bonus attack damage or ability power (depending on which their ally has more of) equal to a percentage of their own attack damage or ability power (depending on which of the two is higher).

Yuumi starts the game with Lv.1 You and Me!, while Prowling Projectile has 6 Levels.

Active: After a 0.25-second delay, Yuumi dashes to an ally champion and attaches to them. While Attached, she follows her ally's movement and is untargetable by everything except TOWER DAMAGE. Yuumi's abilities fire from her ally's location, and she can't attack enemies.

Yuumi can switch among her teammates without a cooldown. If Yuumi re-activates the ability without a valid target, she will detach from her ally and dash up to 250 units in the target direction. Yuumi also detaches automatically if the ally she is attached to dies. Immobilizing effects (besides silences) on Yuumi places this ability on a 5-second cooldown

This is one of Yuumi's unique features that make her a bit diffrent from other supports; with this she can make one of her teammates 2x the threat and with her ultimate Final Chapter she can make it general easier to team fight with her arround.

ZOOMIES

Yuumi heals herself for Lv1 70/ Lv2 100/ Lv3 130/ Lv4 160/ Lv5 190 (+40% AP) and gains 15% movement speed and

Lv1 25% / Lv2 30% / Lv3 35% / Lv4 40% / Lv5 45% attack speed for 3 seconds.

While attached, Yuumi's Ally is targeted by the ability instead.

This is both a heal engine and her buff to her select teammate, this paired with it's attack speed gain and it's movement speed buff can easily help you teammate quickly kill someone before they escape, also it's on a pretty decent heal (Probably second best to Soraka) even with it's high mana cost that makes it somewhat limited during the late game.

FINAL CHAPTER

Yuumi recoils and opens Book, launching 7 waves of Lv1 60 / Lv2 100 / Lv3 140 (+20% of ability power) magic damage over 3.5 seconds. Enemy champions who are hit by multiple waves take only 50% damage from any wave beyond the first, and they are rooted for 1.75 seconds when struck by three waves.

During Final Chapter, Yuumi can move and cast You and Me! and Zoomies.

Also will say that I underlined the words in this section because these are really important to know.

This is her cc/stun which enables her to basically single-handly stop the whole team from moving for a good 3 seconds and expositional slow them down to a point that allows your teammates to kill them easily, can also be used as an escape tool for a ambush