Naga vs. Naiads: Both are water-races, but Naiads are ethereal freshwater spirits focused on navigation and memory, while Naga are physical serpentine beings commanding both fresh and salt water through venom and hydro-magic.
Naga vs. Nereids: Nereids claim the open oceans; Naga dominate rivers, deltas, and coastal waters. Their Sibling Accord prevents territorial overlap.
Influence on Landorya: Naga venom-alchemy has advanced medicine continent-wide; their coral architecture techniques are studied by Dwarven and Human engineers.