Fascinating Insects : What an extraordinary insect

Greetings of friendship to all my friends in the world. Walking in those steps is definitely uphill and also steep. Thorns, sharp pebbles and common thorns get in the way.
All my friends, today I got something truly extraordinary. Because of this animalia, from the beginning I as a nature hunter have never found it. The body color is all black and the horns are also black. I found this animalia in the midrib of a palm tree trunk.

Maybe named Black slug. Black slug is a large terrestrial gastropod mollusk in the family Arionidae, the roundback slug. The black snail is also known as the black arion, European black snail, or large black snail, Arion ater. In the animal kingdom with the phylum Mollusca. It really has an extraordinary attraction for me.
Thank you very much to Fascinating Insects Community Caregiver by @jaki01 and all friends.