Confirmed information
The official Roblox description says players can blast zombies and giant Behemoths. It does not document Behemoth names, health values, attack patterns, weak points, phases, or rewards. Those details should be confirmed in the current game, not copied from an unverified guide.
A Behemoth encounter may be visually different from routine horde clearing, but that is not enough to infer a specific mechanic. Follow the live objective and warnings the game actually displays.
Make observations reproducible
When you meet a Behemoth, note the current game version or event, the visible objective text, your equipment, and what happened before and after each attack. Distinguish a direct observation from a theory about damage or vulnerability. Repeat a test before calling it a reliable strategy.
Coordinate with allies using visible cues and the mission objective. Do not claim that a particular weapon is a counter unless the game states it or repeated, current-build testing supports the conclusion. The public listing only confirms that Behemoths are part of the game.