A short, focused list:
High-speed blender , strongly preferred here. Dates, even soaked, are dense and sticky, and a high-speed blender (Vitamix, Ninja, or similar) breaks them down completely smooth. A standard blender works but needs more time and a watchful eye for stubborn date chunks.
Small bowl ,for soaking the dates in water before blending.
Measuring cups and spoons , for the banana, milk, water, cacao nibs, and vanilla.
Large glass , for serving, since this is a genuinely substantial smoothie that needs the room.