Passive: Blast Shield
Blast Shield provides Vi a shield that scales with how much maximum health she has every time she uses an activated ability (not Denting Blows) on an enemy. This passive is great for jungling (in addition to being a great damage soak while in combat) since it procs off of jungle camps. Unfortunately this passive is not affected by cooldown reduction.Â
There is a countdown reading on the skillbar when Vi's passive is on cooldown. Always be mindful of when your passive is up as it could be the difference between life and death. You can also maximize how much your passive absorbs by timing your abilities to synergize with it, ensuring that it is up as often as possible. This is helpful during the first couple jungle clears. Even if you are low, for example, this passive will allow you to clear an additional camp before you go back to the fountain.
Q: Vault Breaker
A very useful dash that can be used in a countless number of ways. Vault Breaker provides Vi with a gap closer that also acts as a knockback. This ability also grants Vi the ability to pass through a number of walls on Summoners Rift which increases her mobility and gank potential. Vault Breaker can also be used as an escape when Vi is in an unfavorable situation. As a jungler, it is beneficial to use this ability to counter-jungle the opposing teams jungler by passing over terrain and then escaping.
Care must be taken when using this ability, however, since it is very important to land when engaging an enemy. The extra damage coupled with Denting Blows being instantly applied translates to a great deal of damage and that damage can be the difference between a successful gank or an unsuccessful gank.
Also be mindful of other enemies when engaging on a target. If your goal is to hit their AD carry, try not to position yourself so that Vault Breaker hits their frontline, blocking you from engaging. More experienced players attempting to protect their backline will take the hit from you so it may be better to engage with Assault and Battery in this case. The use of this ability is very situational so do your best judgement to decide how to use it.
W: Denting Blows
This ability helps Vi clear the jungle quickly and helps her damage scale late game against enemy champions. Vi does not need to have attack speed in her item build because this passive provides enough attack speed to be effective in and out of the jungle. It is important to note that this passive deals bonus physical damage to champions based on their max health and not their current health, making it a very noticeable damage boost. The armor shred is very useful throughout all stages of the game, especially late game when the enemy has built armor. It is important to always hit the same target three times to proc this ability.
Attack Speed marks help proc this passive against jungle camps and enemy champions. Once the third hit procs the passive, the attack speed steroid is very noticeable and Vi's damage output is increased significantly.
Leveling this ability first to jungle clear does leave Vi very vulnerable during the early game and a nonfactor in early level 1 teamfights. So take extreme care in the early game until other abilities are leveled.
E: Excessive Force
The ability that makes Vi such a fast jungler. Excessive Force just melts creeps and can also be used as an auto attack reset. Auto+Excessive Force+Auto will proc Denting Blows and increase Vi's damage and attack speed. This ability also offers a 600 range AOE behind the target allowing Vi to damage multiple enemies. Unfortunately, the AOE cone will not proc on-hit effects like Frozen Mallet aside from the initial target. The AOE can be used as a ranged harass, however, when creeps are in range of the target.
This ability can be very mana intensive early game if used off cooldown, so be responsible with its use. Also keep in mind that this ability can be seen through walls by enemy champions when farming jungle camps (notably wraiths), so it is a great idea to position yourself behind the camp and then use Excessive Force. I prefer to use Vault Breaker on the entire camp and then use Excessive Force to quickly clear it.
R: Assault and battery
Vi's monster ganking tool. A high damage ultimate that scales great with AD damage, Assault and Battery also acts as a CC ability. Vi knocks up and throws down her target, offering her the ability to dunk a target. A great bonus to this ability is that Vi is immune to crowd control during it and will knock aside enemies in the way between her and her target. Vi also damages the enemies that are knocked aside. It is also important to mention that Vi will be placed behind her target at the end of the cast.
Most of the time, Vi will want to target the AD carry in the backlines of a teamfight which usually guarantees that multiple targets are damaged.
Using this ability acts similar to Maokai's root as she will still target the enemy even if they flash. This will cause Vi to travel a great distance to that champion which may put Vi in an unfavorable position, so caution needs to be taken into consideration before using Assault and Battery. This ability also paints a giant bullseye on Vi's back when used in teamfights since it is very noticeable. Enemy champions will usually draw their attention to you and attempt to kill you. This may or may not be beneficial to your team depending on your build and the status of the game.