What does it mean to be a Ninja Assassin?

While playing Halo: The Master Chief Collection, I came across a mode in the Team Action Sack playlist called Ninja Assassins. It's a slayer type game in which the player is given a sniper rifle, an energy sword, and the boost armor ability, and the mini-map is disabled. The objective is to become the deadliest ninja, but all it is, is a team slayer game. At the bottom of the screen while playing however, there is a ninja level counter with 1-3 out of 3. This count goes up when you get a kill, but seems to have no real significance. Is it pointless or does it have a cause?

Solution 1:

There are actually a couple of stats that get boosted depending on your Ninja Level.

Ninja Level 1

• Shields recharge at a faster rate (2x)
• Assassinations performed at a faster rate (2x)

Ninja Level 2

• Shields recharge at a faster rate (2x)
• Shields recharge sooner than normal (after 3 seconds)
• Assassinations performed at a faster rate (3x)

Ninja Level 3

• Shields recharge at a faster rate (2x)
• Shields recharge sooner than normal (after 2 seconds)
• Assassinations performed at a faster rate (4x)
• Unlimited Thruster Pack energy

Source