I demand devotion Yet offer no reply. My favor is random, My judgment unclear. I appear when I’m needed, Disappear when I’m called. People serve me daily And thank me for mercy.

The carrier of death Many called me a plague I've been used to test science For the smart and depraved

Don't strictly surge in briny spray, I splash in every word you say, I travel too as rainbow light, Crash into your eyes as sight, I swell as well within your mind, Matter not, not hard to find

The truest way to your partners heart, the way to satiate their soul. We have one, while a certain whale has thirteen. Go to the store, by fresh stuff, the come home and prepare it.

I can be slang for a dank nug. I can have weeping branches or curling white bark. I’m useful for swings, houses, forts, and Giving. What am I?