fdisk: /dev/sd1c is not a character device

I hope this message finds you well. I am writing to you because I am attempting to format and partition a drive in OpenBSD but have been met with the following message:

virtual-server# fdisk /dev/sd1c        
fdisk: /dev/sd1c is not a character device
virtual-server# lsblk
NAME   SIZE TYPE   COMMENT          
sd0     50G SCSI   Block Device     
├─sd0a 1.0G 4.2BSD /                
├─sd0b 1.2G swap                    
├─sd0c  50G unused                  
├─sd0d 3.2G 4.2BSD /tmp             
├─sd0e 5.1G 4.2BSD /var             
├─sd0f 5.3G 4.2BSD /usr             
├─sd0g 1.0G 4.2BSD /usr/X11R6       
├─sd0h 6.8G 4.2BSD /usr/local       
├─sd0i 2.2G 4.2BSD /usr/src         
├─sd0j 6.0G 4.2BSD /usr/obj         
└─sd0k  17G 4.2BSD /home            
sd1    100G SCSI   Block Device     
└─sd1c 100G unused                  
virtual-server#

What does fdisk: /dev/sd1c is not a character device mean? I cannot find the error listed elsewhere but wanted to better understand what the issue is. Note: lsblk is installed from the package manager .