For Orcs (especially in Lineage 2 ), "gathering" often means preparing for a "train" (pulling many mobs) or a raid. Ensure your self-buffs (like Frenzy or Guts ) are ready.
Often used by Horde players before a World PvP event or a raid on an Alliance city. ork_marica_na_sbor
Make sure you have enough Soulshots/Spiritshots , health potions, and scrolls of escape. For Orcs (especially in Lineage 2 ), "gathering"