If you shoot a moss arrow at the ground it creates moss so you don't
make a noise while crossing the pad. If the moss doesn't reach the whole
way across you can shoot a water arrow at it and it'll become longer.

If you drop an oil jar in front of a doorway or a narrow path so it
covers the whole way, then lure an enemy towards you so when he's
rushing you can set the oil on fire with a fire arrow. When that happens
the enemy is killed almost instantly.

If you need to take out a guard but cant get behind him, and don't want
to take him out in regular combat you can just hide in the shadows and
shoot him in the head with a broad head arrow.

If you've fought undead (like in the Abysmal Gale) you'll know it takes
at least five arrows in the chest before they die (and sometimes it
doesn't even kill them) or it'll take however many knife hits, there is
an easy way to kill them. (besides holy water) You can throw a flash
bang and that will not only blind them but take away half their life.
Another flash will finish the job or you can engage in combat, which is
now far easier for the zombie has been reduced to a regular human's life
or less.