The biggest change in the Teamfight Tactics 9.15b update is with the 5-cost units like Karthus and Kayle, both of whom are being nerfed. Karthus is getting a reduction in damage from his skill, which also affects his level 2 skill, while Kayle's skill will now cost slightly more mana.
Key points to note in the Teamfight Tactics 9.15b update
Runaan's Hurricane deals increased damage
Building a Hurricane in Teamfight Tactics can be quite challenging. After all, it requires a Spatula and some essential items to complete. But Riot is increasing the damage of Runaan's Hurricane by 50%, which could really make it useful. Now, if you have champions like Draven or even Tristana with additional attack damage, Hurricane can upgrade their damage and make them much more effective against multiple enemies.
Karthus's ultimate deals less damage and targets fewer enemies
Karthus is one of the most significantly weakened champions in Teamfight Tactics 9.15b, as the damage of his ultimate has been reduced by 50 at level 1 and 100 at level 2. Perhaps the worse thing for Karthus is at level 2, currently, Karthus will only target 7 enemies with his ultimate instead of the original 9. This means that when a level two Karthus uses his ultimate, it may not attack all enemy units on the opponent's board.
Kayle won't frequently use her shield anymore
Kayle has also received changes in this update, though not as bad as Karthus. Kayle's ability now consumes 125 Mana, meaning she won't be able to use her shield frequently. Another important part of this is that she doesn't gain additional mana to compensate for the increased cost. This means her first skill usage will be significantly delayed compared to the previous update.
Guardian Angel provides less health regeneration
Guardian Angel has been a great item since it was buffed in previous updates, but it was a bit too strong, so Riot decided. Now the item will resurrect units at 800 health instead of 1000 as before. This doesn't make it unusable, but it will make you think carefully about equipping it to which champion, rather than just putting it on anyone and knowing it will be useful.
Blitzcrank will cause allies to target his hooked target
Riot has been trying to get Blitzcrank's allies to assist him since the Teamfight Tactics updates, and they still haven't succeeded. But after the patch 9.15b update, there's hope that allies will direct their attacks towards the enemy on Blitzcrank's hook. If this works consistently, it could be a significant buff for Blitzcrank, as anyone he hooks will be immediately focused down by his team.
We hope that with our summary article of 5 things to know about the Teamfight Tactics 9.15b update, you'll understand more about the changes in this update, ahead of the introduction of some new characters and Origins, to see all the changes in Teamfight Tactics 9.15b, you can view the detailed content here.