Hey Bob i got you a new mob idea, hope you like it!
The Desert shell
The first impression of this mob is of a big sea shell in the middle of a desert, to activate the battel the player must hit the shell, it is in a dormant state and will not harm the player and will stay completely still, after hit the desert shell will rise out of the sand and will present it self as a big lizard with a huge sea shell on his back, the lizard is also completely covered with sand and other rubble, in this fase his attacks are more sluggish but hit with weight, his attacks could be tail strikes, paw slaps,roiling, blocking with his shell and throwing sand to try to blind his opponents, to go to his second fase you must break his shell and get rid of his rubble sticked to his body (there could possibly even be equipment and other junk stuck to him too), the second fase he presents himself as a iguana like lizard with a sticky mucus excreting from him and a foldable sail on his back, he would be much quicker in this stage, he would still have his tail and claw swipes however they would be quiker but less damage however in this fase he would do more ranged attacks, he would be able to shoot his stick mucus and passively leave it on the floor, when the player walks on the mucus the would get the "stick" status effect,when the effect is applied the player would have to limit there movement since the more they move the more rubble would stick to them making there movement slower depending on the terrain they walk on, it can also shoot cactus spikes from its mouth since its primary food source is cactus, the attack would be in a more of shotgun like blast, the last special attack would be with his foldable sail on his back, the sail would have to unfold and charge (in the sunlight,btw he can move and attack while the sail is out), after chareged enough the sail will fold and unfold rapidly before unleashing a blinding light (sort of like a flashbang) blinging or stunning the player, while the sail is out it would grant extra damage if hit as his weak point.
Drops:I was thinking of 2 main drops.
First vases filled with mucus, you would be able throw these vases and leave a puddle of mucus that is walked on would put the "sticky" status effect on any mob that walked on it.
Second a hand fan that would be made of it's sail, you could hold it on your of hand and charge it to be able to unleash the blinding flashbang attack.
Lore: Basically these Desert shells would start life in the ocean hunting small fish at night and at day basking at the water surface in the sunlight with there sail,at this stage in there lofe they dont have mucus or a shell, when maturing they would dig up a sea shell and place it on there back and make journey out of sea and to the deserts, but why use the shell or go to the desert you may ask? Well the shell is needed to protect them in there journey to the desert since juvenile Desert shells are the favorite prey of nagas, the shell would protect them from its poisonous projectiles, the reason they go to the deserts is to find there favorite food...cactus and as a byproduct of there food choise the mucus is made.
I hope you like my mob idea