Antlion

Antlion's Rage. Antlion shows up in the beginning of summer, demanding tribute, every rock you give it delays Antlion's Rage by 1 day, and you recieve 1 Desert Stone. every trinket you give will delay Antlion's Rage by 2 days, and you recieve 2 Desert Stones. and if the Beach Toy trinket is given, it delays Antlion's Rage by 3 days, and gives you The Lazy Deserter Blueprint. Antlion's Rage is a timer that happens once Antlion shows up, after 4 days of summer, Antlion becomes enraged, warning you to give tribute to it. Within 2 days after Antlion becomes enraged, she releases her rage. Causing 1d6  large sinkholes to appear over time where the party is, dealing 10(2d10) Bludgeoning damage, destroying all structures within the sinkhole, and preventing new structures to be built there for 20 (1d20+10) days. And will calm down for another 5 days, becoming enraged again if players once again fail to give tribute.

Displeased. Antlion will not attack players and players cannot attack Antlion, but if Antlion is given a cooled or hot Thermal Stone, Antlion becomes hostile, and begins to attack, Antlion uses it's Ring of Sand attack. And can use it's Ring of Sand and it's Sand Spikes attacks as bonus actions.

Ring of Sand. Antlion Creates a ring of Sand Castles 20 ft around it, preventing players from leaving, and despawn after 3 rounds, if a Sand Castle is lit on fire, they turn into Glass Castles

Sand Spikes. Antlion Sends up 1d6 Sand Spikes within the ring of sand castles, Dealing 40(4d20+20) piercing damage, and disappear on the Antlion's next turn. If the sand spikes are lit on fire they will turn into Glass Spikes, and stay indefinitely, and can be carried around.