Passive allows you to get some health after your next attack
Essentially healing you.
Because you have a lot of armor and magic resistance it makes it harder to lose health and when you keep regenarating health it makes it nearly impossible to die.
Especially in 1v1s you are basically unkillable.
And with item Spirit Visage it heals you tons more making you even more Unkillable :D

//Lathyrus
In lane, you will want to use your passive to heal up after trades, or by having the passive up when you engage on the enemy, this way you can W in, and auto-attack immediately to heal up. But generally, you will just want to use it any time it is up and save to go for it, unless you know you want to go in soon. You can just heal of the minions so you don’t even need to go in.

Q does a shock wave (kinda like a punch) in a small range.It slows the enemy and if in close range knocks them in the air and gives knockback.
Its your main source of damage.
3 Tips to use your Q:
-Use the knockback to knock enemy in your turret range
-Use the knockback to knock enemy outside of their turret range.
-When running push the enemy backwards to escape
//Lathyrus
The knockback on your Q is directional to where you are aiming it, this means you can knock people into your team, or away from your team whenever needed just by aiming it properly. Furthermore, you most often will want to use the knockback to cancel people’s dashes, think of Leona’s Zenith Blade or Rakan’s Grand Entrance. This will often save you and your team’s life.

Your W makes you dash to an enemy while Untargetable and it has some travel time but you will get to the enemy no matter what.It also roots the enemy.
You use this to chase enemy or root or dodge skillshots it dodges stuff like Veigar Ult Darius Ult ... Basically a better Fiora W.
//Lathyrus
Its strong,very strong :D

Your E allows you to put a living sapling child (so cute) that gives vision of the area and when an enemy or minion approaches it it will chase them and explode slowing the enemy.It can only sit for 30 seconds.
2 Tips To Use It:
-Stack them in a bush and make enemy go near that bush giving them a lot of damage
-Vision
//Lathyrus
You will want to use your E’s inside of bushes most of the time since the empowered effect is a lot better than the standard E. However you can still use it if you need to poke a bit. Apart from some poking, you will mostly use them to cut off chokepoints, and give vision. The damage from the saplings is quite good and can really chunk the enemy team whenever they try and go anywhere on the map.
You can also use your E when you want to facecheck a bush or need to clear a ward, since you will both have vision in there, as well as have protection should an enemy come close to the bush.
Apart from that know that the movement speed of your saplings is dependant on the type of boots you have. Base boots will increase their speed by 25, swifties and mobis will increase it by 60, and the other boots will increase it by 45.

Whenever you use your R it will send out a large number of brambles that will move forward at a slow pace.When it collides with an enemy it gives you speed and roots the enemy.
Use it in teamfights or to catch the opponent.
It gives a ton of damage aswell.
//Lathyrus
You will want to use your ult, when either the enemy team or your team is engaging, don’t use it to engage yourself. It is too slow to actually use it as an engage ability so use it as a layer of CC during an engage rather than the start of it.
Furthermore, you can also use it when taking turrets or other objectives as a large zoning tool, since the hitbox is enormous and thus will give enemies little choice to either move away, or get hit, giving you a bit more free time.

Pros:
+ Easy to get vision
+ Good ult for objectives and disengage
+ Damage is high for being a tank
+ Good Crowd control
+ Really tanky
+ Good engage
+ Easy to peel for ADC
Cons:
- Early game is weak
- Very team dependent
- Low mana pool
- Needs to scale