Shurima Assassin Ta’krul
So we have a few Shurima champions but none that are dedicated assassins(not including full ad/crit nasus) The lore could have to deal with being a behind the scenes murderer who has been hired to take out Azir after his resurrection.
Passive - whenever a enemy touches the sand, your next ability on them causes you to rip the sand from their body dealing x magic damage
Q - (Shurima shuffle)Spin with enough ferocity that you rip the sand from the ground and deal damage to enemies around you
W - (Pocket Sand)Create a small shroud of sand that lasts 7/10/15 seconds, can have more then one at a time and makes the champion invisible while inside of. Enemies that step inside reduce the duration by 30%
E - (Sand Magician)Teleport from one sand shroud to another. Cannot be used if you are not inside of a shroud. If you stay in one shroud for more then 5 seconds it will shimmer slightly.
R - (Ferocious Pocket Sand) spawn 5/6/7 Pocket Sand spots in an area around the target location, Passive: any enemy that step in the sand take x magic damage instantly, and x bonus true damage over 2 seconds after leaving the sand
Edit: if anyone has any ideas or things i could update please leave a comment :D Also, I had another idea for his ult that would involve him covering a huge area around him in sand, it would allow him to cast his w anywhere in the circle and he gains increased range and damage on all of his abilities. It would deal no damage or reduced damage of the passive