The following is a generic monster that can fit into nearly any setting and is not specific to Eira. Sorry for the short post today, everyone, busy day ahead and behind me already.
For any who live in PA, I would just like to say I take I-81 to work. That should be explanation enough.
Found in the deepest dungeons of the world are the grate tentacles. Huge writhing masses of tentacles that shot up from holes in the floor, grates, cracks in the wall, etc when something draws near. It is unknown if each mass of tentacles is a separate beast or if all the tentacles are a part of some ancient, elder thing buried deep within the world.
Hit Dice: 6
Armor Class: 5 
Attacks: 8 (1d4)
Saving Throw: 11
Challenge Level/XP: 4/120
On any attack the grate tentacle has a 30% chance of grappling the target of its attack.