Ankheg Totem

Tremorsense. The Ankheg Totem has tremorsense out to a range of 30 feet.

Tremor. The Ankheg Totem lets out a large, deep tremor in the earth every 30 seconds. It is easily heard by creatures above ground in a 30 foot range around the totem, and that area is also considered difficult terrain. When it goes off, every creature that doesn't have a burrow speed must make a DC 15 Strength saving throw of fall prone. Ankhegs can perceive the tremor from a range out to 1 mile.

Spellcasting. The [monster name] is a #-level spellcaster. Its spellcasting ability is [ability score] (spell save DC #, +# to hit with spell attacks). The [monster name] has following [class name] spells prepared:
Cantrips (at will): [spell name], [spell name] 
1st level (# slots): [spell name], [spell name] 

Wave of Fear.  The totem releases a magical wave of terror meant to affect anything that isn't an Ankheg. Any creature within 15 of the totem must make a DC 13 Wisdom saving throw or be afraid of the totem for 1 minute. They can repeat the saving throw at the end of each of their turns. Creatures can only be affected by this once per long rest.

Shielding Wave. Every ankheg within 20 feet of the totem gains 5 temporary hp.

Command. As a reaction, the Totem can allow one ankheg within 20 feet of the totem to reroll a failed attack.