The most successful core build for Karthus Bot includes Blackfire Torch, Shadowflame, and Rabadon's Deathcap, which currently boasts a 59.6 percent win rate. Another strong alternative replaces the final item with Liandry's Torment, maintaining a 52.4 percent win rate. You should always aim to complete Sorcerer's Shoes as your primary boots choice for maximum magic penetration.

You should use a Dark Harvest primary rune page from the Domination tree, including Cheap Shot, Grisly Mementos, and Ultimate Hunter. For your secondary tree, select Precision with Presence of Mind and Last Stand. This specific rune configuration has a high win rate of 55.1 percent based on recent data.

Karthus Bot is currently ranked in the B tier for Patch 16.2.1. He holds a carry score of 6.1 out of 10 and is considered a niche pick with a low pick rate of only 0.5 percent. This suggests he is a viable but situational choice in the current meta.

Karthus's overall win rate as a Bot laner is 43.8 percent across 217 games in Platinum and higher ranks. However, his build-specific win rate is significantly higher at 47.9 percent when players use his optimal items. Certain high-performing rune setups can even push his effectiveness to over 55 percent.

While the data is specifically from Platinum+ games where his win rate is 43.8 percent, Karthus can be difficult to pilot due to his 7 out of 10 difficulty rating. His performance relies heavily on hitting skillshots and proper positioning, which may be challenging for lower elo players. However, his high carry score of 6.1 suggests he can impact games significantly if played correctly.

With a low pick rate of 0.5 percent and a B-tier ranking, Karthus is currently more of a specialist champion than a top-tier meta pick. His overall win rate of 43.8 percent is relatively low, meaning it may take significant practice to see consistent results. For those who master his Q and global ultimate timing, he offers unique carry potential that many other Bot laners lack.

The 43.8 percent win rate is quite low, likely due to a combination of his high difficulty and a small sample size of only 217 games. Since there were no buffs or nerfs in Patch 16.2.1 for the champion or his items, his standing remains relatively unchanged. Success on Karthus is highly dependent on individual player skill and optimal rune choices like Dark Harvest.

The best first item is Blackfire Torch, which has a 49.7 percent win rate and an 87.1 percent pick rate. This item provides the essential mana and ability haste needed to spam his Q ability and clear waves efficiently. It serves as the core foundation for his subsequent power spikes with Shadowflame and Rabadon's Deathcap.

Karthus Bot is a strong pick when your team needs magic damage and you are not worried about high-mobility enemies. Since his ban rate is very low at 0.6 percent, he is almost always available to be picked. He excels in compositions that can protect him or lock down targets so he can maximize his area-of-effect damage.

Karthus experiences a major power spike upon completing Blackfire Torch and reaching level 6 to unlock his global ultimate. You should focus on maximizing Q first, followed by E, to increase your DPS in skirmishes. Use Exhaust and Flash aggressively during teamfights to ensure you can deal maximum damage even after entering your passive state.

Karthus scales exceptionally well into the mid and late game as he completes items like Rabadon's Deathcap and stacks Dark Harvest. While his early game can be vulnerable, his global ultimate pressure increases significantly once he has Ultimate Hunter stacks. His late-game teamfight presence is his greatest strength, especially with a 59.6 percent win rate on his full core build.

Karthus received no direct changes in Patch 16.2.1, and there were no changes to his core items like Blackfire Torch or Shadowflame. His stats and performance metrics are consistent with his state prior to this patch. He remains a stable B-tier pick for players who are familiar with his mechanics.

The recommended Dark Harvest and Precision secondary setup is highly effective, with a 55.1 percent win rate, and should generally be your default. Items like Presence of Mind and Last Stand are critical for his mana sustain and passive damage output regardless of the opponent. Sticking to the standard high-win-rate rune page is usually better than experimenting given his current 43.8 percent overall win rate.