With the recent Rell rework, she has turned into a pretty decent jungler. She is great at ganking early, and when she ganks a lane with any engage she is almost guarnteed to get a kill or some summoners. Play it right, and you can nearly permastun them. Rell has a decent clear, great ganks, and can provide great peel for her carries.

I went though hell trying to make this champ work and i have found a playstyle that works very well for me, and i hope it works for you as well!

Early game
When playing Rell in this way, it is good to look for an early level 3 gank if possible. if you have a lane with good gank setup and you know that the enemy laner(s) are going to shove them in, path for your lane and go for it!

For example, if you have a Sett versus Quinn top. You can start on raptors (or wolves) and clear up and gank as Quinn gets the lane shoved. You can Flash W into her and then Sett could follow up with a grab or you could with your Q. You will almost always get her Flash or the kill if you do this. Be sure to ward your opposite buff if you do this.

However, Rell can also comfortably full clear before 3:30 if there are no good early opportunities. Also, Rell's Objective take is not very good, so she will not be soloing much of anything fast. She can solo a dragon with near full health, but it will take forever. Priotitize the first hearld, and try to trade it for dragon if possible

Clear example (credit to shapeshift on YT)

Mid-Late game
Your goal here should be to keep farming, and group when your team as needed and peel for your carries. With this build you can also catch lane waves, and push them, but you will not be taking towers very quickly at all. Rell falls of compared to other charchters past the 35-40min mark, so try to end games quickly if possible.

While testing Rell in the jungle, whenever i built full tank, i felt a little useless in the damage department, and if i built her full AP (which turns her into a funny magic assasin), i would just get blown up in teamfights because Rell likes to go in and jump on people.

Because of this, I enjoy building her mostly tank, but with a little bit of AP. With this build, she can still easily peel and tank for her carries, but she also has a chance to win jungle skirmishes, and clear waves.

I almost alwyas go Sunfire Aegis as my first item becase Bami's Cinder is great for speeding up her clear.

Evenshroud is a great mythic on Rell in general, almost everything in her kit immobilizes, so it is a big help for her damage.

I like building Zhonya's Hourglass because with this build she is a bit less tanky than usual, and it helps her live through any burst. Also, with the Perfect Timing rune, having a free stopwatch that early in the game can turn pivotal early-game fights.

For boots, i usually choose Ionian Boots of Lucidity for the cdr, as long as they do not have too much CC on their team. Take Mercury's Treads as needed.

The rest of your items are very situational based on the enemy team and what your team needs. If your team needs a bit more damage, you can build more AP focused items like Cosmic Drive, or take Demonic Embrace for the extra damage. If you are the sole tank on your team, you can build Thornmail or Force of Nature. A great synergy is Abyssal Mask because it only adds to her passive Armor and MR stealing if the enemies build lots of MR. Redemption or Zeke's Convergence are also solid if you need to be more suppourt focued.

Primary runes: Inspiration

Glacial Augment is a great keystone for Rell to take in general, but i feel it is even better in the jungle because it really helps your ganks.

I take Perfect Timing for the free Stopwatch to help with her build cost, and if you get snowballing, a 7-10min free Stopwatch can completley change an early game fight. you can also take Magical Footwear if you are not building Zhonya's Hourglass

Future's Market is great for getting items earlier than you should

Cosmic Insight is also solid, but Approach Velocity is also solid.

Secondary tree: Sorcery

Nimbus Cloak is extremley helpful for ganking and gap closing.

Celerity or Waterwalking are both good second picks

Shards

AH, AP, and Health are good shard picks

I hope you have as much fun with this build as I have been having! Hope the build was helpful, have a great day :D