Heliodoros
The Destroyer
Worms would spawn just like when breaking natural stone or dirt piles - "flying" away from freshly breaked block (if you know you know). Worms would have 2 seconds invincibility so Player won't kill it unintentionally.
Surface chance to dig up Worm is n%
When it rains chance become 2n% (doubles)
Underground & Caverns chance is 1.5n% (no rain bonus below surface)
Also, there should be max (capped) amount of Worms that Player can get in some period of time, rendering placing & breaking dirt blocks unuseful. It's just a small bonus, not the main source.
P.S. same goes for Grubbies, but in Jungle biome from Mud Blocks.
Surface chance to dig up Worm is n%
When it rains chance become 2n% (doubles)
Underground & Caverns chance is 1.5n% (no rain bonus below surface)
Also, there should be max (capped) amount of Worms that Player can get in some period of time, rendering placing & breaking dirt blocks unuseful. It's just a small bonus, not the main source.
P.S. same goes for Grubbies, but in Jungle biome from Mud Blocks.