Oblidra the Void Lord

Melee attack: hits for 338 damage, up to 5 tiles away, every 1 to 3 seconds.

Mortar shot: hits for 170 damage, 7 times per use, up to 30 tiles away, every 2 to 3 seconds.

It puts these on the ground:

Hydra Boss Beam Mortar Projectile

Beam: hits for 575 damage.

Burst out of the ground: hits for 101 damage, every 8 to 14 seconds.

Shockwave: hits for 710 damage.

Stalactite mortar: hits for 270 damage.

Lava mortar: hits for 473 damage.

Nilipede mortar: hits for 338 damage.

Sleeps underground until the bait for its own biome is dropped within three hundred tiles, then races to it, swallows it and blows a three tile crater open to start the fight.

Dives underground once a player is within thirty tiles, tunnels to one of five fixed spots tearing a two tile wide trench through the ground, then bursts out and smashes everything within two tiles.

Stays underground and cycles between fixed patrol points while nobody is fighting it, wearing a shield worth thirty percent of its health that fills itself back up.

Winds up for three seconds then fires a beam that starts two tiles in front of its mouth and crawls toward you, laying a new burning segment every fifth of a second and speeding up ten percent with each one, thirty segments from a single head and five fewer for every extra head.

It puts these on the ground:

Hydra Boss Beam Mortar Projectile

Bites at anything standing right in front of its head once the fight has started.

Every second volley it drops two or three roaming void traps, and they can land on water and pits.

It puts these on the ground:

Moving Void Trap Mortar Projectile

It carries a shield worth thirty percent of its health, and the soft spot in front of its mouth only opens once that shield is gone.

If every player gets a hundred tiles away it goes back to sleep and the fight resets.

Oblidra grows three extra heads, a nature head, a desert head and a sea head, one every second, and all of them die the moment the main body does.