Combat profile
For Minecraft 26.3 / NeoForge, wave base values and supported behavior can be changed per registry entry: see health, damage and base armor and mob abilities. Tier, size and wave scaling still apply.
Behavior
It targets defenders at long range, throws damaging boulders, advances when necessary, and attacks the Nexus. Tier 2 is the larger Big Thrower variant.
Other siege variants: the Piglin Thrower launches explosive iron balls; the Zombified Piglin Thrower uses fire-starting lava boulders. Both have their own spawn eggs, models and wave entries.
For normal boulder defense and its 50% chance and limits, see the datapack tag guide.
Drops
In the current Minecraft 26.3 / NeoForge build, the mob's own loot table drops the items below. Each range is rolled independently. These default pools have no Looting bonus; server datapacks can replace them. A minimum of zero means that item can be absent.
Rotten Flesh • 0–2
Cobblestone • 1–2
Small Remnants • 1 guaranteed + 25% chance of 1 extraThe Thrower death hook adds one Small Remnants, and the shared IM death hook independently has a 25% chance to add another: normally 1, occasionally 2. These are separate from the item ranges above.
Compare the additional mob drops; this is the mod's own loot, rather than an inherited vanilla mob table.
Vanilla replacement
No vanilla mob converts into a Thrower.