Worm AI
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This article is about the AI type. For the critter, see Worm.
Worm AI is an AI type followed by most multi-segmented enemies.
Behavior
An NPC with the Worm AI exhibits the following behavior:
- Can pass through all solid blocks
- Unaffected by liquids
- Immune to knockback
- Drops loot from the head segments
Notes
- Worm-type creatures have a variable number of body segments. For example, a Devourer has 8–12 body segments, and a Giant Worm has 4–6 body segments.
- Worm-type creatures always produce a specific sound when digging near the player's location (besides Leeches which make no noise when released from the Wall of Flesh), so in most cases it is not only possible to tell when, but even where will it emerge next – and to aim and/or dodge accordingly. The speed of the sound gets faster as the creature gets closer, which can also help.
- Weapons that appear to go through blocks, like spears, hurt worms when going through blocks. This does not happen with most other enemies.
- Worms can dig through liquids as though they were solids.
- All worms save for the Leech, Wyvern, Milkyway Weaver, Phantasm Dragon, and Crawltipede will occasionally cause particles to spawn from the blocks they dig through (1/100 (1%) chance each tick[1]). Note that all worms excluded, except the Leech, typically move through the air.[2]
Tips
- Weapons that are capable of piercing enemies, like Flying Dragon, Rainbow Gun, or Death Sickle, are exceptionally effective against all types of worms.
Trivia
- It is the only AI that is used by both non-boss enemies and a boss (Eater of Worlds).
- If using Autopause at the exact moment a worm is killed, it is possible to see negative numbers when the cursor is hovered over it. This is because, since all segments share the same health, damaging all of them at the same time can lead to the game not realizing that the worm's health is below 0 until after resuming.
List of NPCs with Worm AI
Blood Eel(Desktop, Console and Mobile versions)
Bone Serpent
Crawltipede(Desktop, Console and Mobile versions)
Devourer
Digger
Dune Splicer(Desktop, Console and Mobile versions)
Eater of Worlds
Giant Worm
Leech
Milkyway Weaver(Desktop, Console and Mobile versions)
Phantasm Dragon(Desktop, Console and Mobile versions)
Tomb Crawler(Desktop, Console and Mobile versions)
Truffle Worm
World Feeder
Wyvern
History
- Desktop 1.1:
- All segments now share a life counter, instead of individual life counters for all segments – except for the Eater of Worlds.
- Desktop-Release: Introduced.
- Console-Release: Introduced.
- Switch 1.0.711.6: Introduced.
- Mobile-Release: Introduced.
- 3DS-Release: Introduced.
References
- ↑ A tick is a time unit countable by the software. Most of Terraria's updating logic happens every tick. A tick has the length of 1/60th of a second, hence there are 60 ticks in a second and 3600 ticks in a minute.
- ↑ Information taken from the
Desktop 1.3.5.3 source code, method AI_006_Worms()inTerraria.NPC.cs. There may be inaccuracies, as the current Desktop version is 1.4.4.9.