Karthus

Preserve health, waves, and summoners instead of chasing low-value fights.

Group for necessary objectives only when item spikes are available.

Force decisive 5v5s around soul, Baron, and Elder with item advantages.

Keep lanes stable and avoid forced fights before core items.

Group around dragon and mid waves with frontline first.

Fight slowly from vision lines and let carries kill the nearest target.

Push lane advantages into invades, dives, plates, and first objectives.

Convert gold leads into towers before the enemy reaches scaling items.

Avoid slow equal fights if the comp has been outscaled.