Multiattack: given the amorphous nature of Shikagwash, they can attack creatures at any part of them

Omnidirectional: there is no real front or back to Shikagwash so they cannot be flanked

Water-bound: Shikagwash must exist only in liquid, although the depth of the liquid could be as little as 1mm, but the volume must be at least 4 liters/1 gallon.  While inside the liquid, it can choose not to reveal itself giving them advantage on any hide/stealth attempt.  They will not leave the water, and if they can no longer attack, they will rescind into the water becoming almost invisible.  When in water and trying to be hidden, it requires Perc 23 to detect.  They will also only emerge once someone is in direct contact with the water, nor will they attack anyone not in contact with water.

Pseudopods (x2): Melee attack: +9 to hit; 15' reach; 2d6+4 bludgeoning damage

Death From Below (6): Shikagwash can utter a death-from-below scream, frightening any in the 30' cone that they choose.  CON 12 or gain frightened condition for 2d4 rounds.  The victim can make a save each turn to attempt to remove.

If a victim who is already frightened is affected by another Death From Below scream, they become catatonic.  They can no longer do anything on their turn except attempt to free themselves from the effect through the CON 12 save.