What is the pro build for Karthus in patch 26.19?

The most-recent pro Karthus build is shown at the top of this page — full item order, runes, skill order and summoner spells from a tracked professional player's solo queue game.

Which pros play Karthus the most?

ggez.gg tracks all major-region pros (LCK, LEC, LCS, LPL, LTA, VCS) and surfaces every recent solo queue Karthus game with the player's name and team logo.

Are these Karthus pro builds from solo queue or competitive?

Solo queue — every entry comes from a Riot match-v5 record on a verified pro player's account, not stage play. That keeps the build data current with patch 26.19.

How often are Karthus pro builds updated?

New pro Karthus games are ingested every few minutes and the list refreshes automatically.

Can I see the runes and skill order for each Karthus pro build?

Yes — expanding any entry shows the full rune tree, skill order (Q/W/E/R points-per-level), summoner spells, item order with timestamps and final stats.