You can get it to spawn next to your base because of the following: It always respawns at it's last location, so if the heatwave ends while you are following it you will know where it is for the next heatwave. It also chases you when you eat flowers... hint hint

Find a phenix during a heatwave and follow it until it ends. The phenix will turn into ashes and land on the ground but will spawn right back at the same exact spot during the next heatwave. Build a trap 6 blocks high so I can't glitch out and you have yourself a trapped phenix to tame:)

So can we just wack it with an ascendant touch untill it's tamed?

It introduced a new taming method,while not the pseudo-boss we prayed 4 but to tame it u set it on fire with flame arrow,flame throweror a fire Wyvern,they only spawn during heat waves.keep this in mind.