> You can use it to do the following simple tasks: lift, drop, hold, push, or pull an object or a creature; open or close a door or a container; grapple someone; or make an unarmed strike. Your DM might allow other simple tasks to be added to that list of options.
Your trunk can’t wield weapons or shields or do anything that requires manual precision, such as using tools or magic items or performing the somatic components of a spell.