Anyu's Feeding Sharks (Arteria)

As an action, you create a hunter shark out of pure water. These sharks act on your turn, are controlled by you, the shark is friendly to you and your companions. They act on your initiative, but have their own turns. They obey any verbal commands that you issue to them (no action required by you). If you don't issue any commands to them, they defend themselves from hostile creatures, but otherwise take no actions.

Using a Higher-Level Spell Slot. You summon an additional shark for every spell slot above 2.