Ninja Gaiden Sigma 2

After you have picked up the Ultimate Guidance scroll, hold down when there are floating yellow/blue/red essences around you to absorb them into an instant UT and unlock the trophy.

This will be your favourite move in the entire game and you will absolutely want to master it. It is very safe, very powerful and as long as you kill at least 1 enemy with the previous UT (for new essence to appear) it is completely spammable. To make things even better you can jump around and time your UT at landing, thus getting a completely instant charge. This is called the On-Landing Ultimate Technique or OLUT.