Forming a new nest or worm will destroy anything that is in the way, which can include members of the expansion group. Once they have found a suitable spot, each biter/spitter in the group dies and forms a new nest or worm. Furthermore, with higher evolution, the groups are bigger on average. The interval between enemy expansions is global, and the higher enemy evolution, the shorter the interval is on average. This group will search for a suitable spot that's 3-7 chunks away from existing bases. The nests are highly resistant to fire and otherwise generally more resilient than a medium worm.Д®very 4-60 minutes, a group of 5-20 biters/spitters will leave their base to create a new base which will consist of as many worms/nests as there are members in the group. Enemies not engaged in combat may seek out the nearest nest for protection. Nests exposed to pollution will use it to send enemies to join attacks. While nests themselves are generally defenseless, the enemies they release over time effectively serve as a form of guards to distract the player and any nearby turrets, and are often accompanied by worms. They are just as resilient as Big worms, with much greater range. The further away the player goes from the starting area, the stronger the worms become.Д«ehemoth worms are the most dangerous of worms. In map generation, the game restricts higher tier worms behind the distance from the starting point. Below these evolution factors, worms can only be created by the map generation. This is 0.3 for the medium worm, 0.5 for the big worm and 0.9 for the behemoth worm. Worms are only created during enemy expansion when a certain evolution factor requirement is fulfilled. Like biters and spitters, behemoth, big and medium worms spawning is influenced by the evolution factor. Worms come in 4 sizes, their power increasing with size. However, placed buildings and tiles are unaffected by the acid puddles, but still take damage normally by the acid projectile. They will spit acid at the player, which can also leave acidic puddles on the ground that can still damage players and vehicles, as well as slow them both down and leave a brief acidic, damaging effect for a few seconds. Unlike other enemies, they are also highly resistant to fire. They rely on high damage, great range and splash damage to keep the player away from the worms and the nests they protect, but either one of these advantages can be overcome. They act like static turrets and will not follow attackers. The Worms are natural allies of biters and spitters and will attack the player if they get close enough with an attack similar to spitters'. The bulkiest of the spitters and so can take even more damage. Their behaviour and size classification are the same as with biters, but their health is universally lower and they are resistant exclusively against explosives, with no physical resistance. Most entities of the game have a much lower resistance to acid than other damage types (including turrets and armor), so spitters are effectively more potent against the player and his factories. Both the stream and the puddle of acid deal damage of time and slow down players and vehicles. Due to the spitters' predictive aiming, the acid stream can be dodged by suddenly changing walking directions or standing still. Using predictive aiming, they spit a stream of acid at enemies which leaves behind a puddle of acid where it hits the ground. Their main difference from biters is their ranged attack. Spitters are much like biters and only appear slightly later on in the game as the evolution factor increases. Can attack through walls, hitting objects directly behind them. Extremely durable and nearly immune to small arms, except for the strongest ordnance.

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