Minecraft Volume 3 (Graphic Novel) by Sfe R. Monster 

Candace, Evan, Grace, Tobi, and Tyler continue their adventures in the world of Minecraft and find themselves stumbling upon a mysterious ruined portal. Arriving to a strange and wonderful corner of the Nether that they've never seen, the group turn to their Nether expert, Grace, for help. However, as they face new threats, Grace finds that the team's reliance on her in the Nether is hitting a breaking point! The group discover themselves deep in a bastion and now have to face their most intense challenge yet...without their expert. It'll take the full force of the entire group to overcome the unknown!