The words trilogic and trilogical exist, but they are very rare and unidiomatic, and you would do well to avoid them. Offhand I can't think of any circumstance where you could not use the noun trilogy rather than a phrase such as trilogic work.
lord of the rings trilogy was truly amazing. It is truly out of this world.
The plural of trilogy is trilogies.
it is the prequel of the trilogy
A trilogy.
There are three movies in a trilogy.
Darklands Trilogy was created in 2005.
The Prodigal Trilogy was created in 2008.
Viking Trilogy was created in 1957.
Auton trilogy was created in 1998.
Underworld Trilogy was created in 2010.
The Wimbledon Trilogy was created in 1993.
The Firebringer Trilogy was created in 1985.