Probably has already been mentioned) To me, the crack in the mask looks like tears and the black slit design in the mask looks like a smile. It gave me shivers when
Rimuru Mask by chi118r0 on DeviantArt
Anti-Magic Mask | Epic Seven Wiki for Beginners
TenSura mask" Sticker for Sale by Hocku | Redbubble
Rimuru's Mask - Etsy
STL file Rimuru Tempest Mask - Tightening 🎃・Model to download and 3D print・Cults
Amazon.com: P1PSZ Tempest Rimuru Mask with 2PC Slime Rimuru Keychain for That Time I Got Reincarnated as a Slime Cosplay Costume (A) : Clothing, Shoes & Jewelry
Amazon.com: P1PSZ Tempest Rimuru Mask with 2PC Slime Rimuru Keychain for That Time I Got Reincarnated as a Slime Cosplay Costume (A) : Clothing, Shoes & Jewelry
Anti-Magic Mask | Tensei Shitara Slime Datta Ken Wiki | Fandom
Made Rimuru's mask as a commission : r/TenseiSlime
3D model Rimuru Tempest Realistic Mask VR / AR / low-poly | CGTrader
Anime That Time Got Reincarnated As A Slime Mask Cosplay Rimuru Tempest Full Face Plastic Mask Halloween Masquerade Headgear - AliExpress
Rimuru Tempest Mask - Black - Rimuru Tempest - Posters and Art Prints | TeePublic
Amazon.com: Nsoking Anime That Time I Got Reincarnated as a Slime Cosplay Rimuru Tempest Mask (19 * 24cm(7.48"*9.44"), White) : Clothing, Shoes & Jewelry