Allos are my one of my favourite if not my most favourite creature in all of Ark and if I’m being honest I believe Allos are underrated, and I’ll tell you why. Some people question their uses because if you want a fast ground mount people tend to choose a Carno and if they want a power mount they choose a Rex or a Spino. Allos are in between, fast and a good damage; alone they are dangerous but in packs they are a force to be reckoned with because we all (or most of us at least) know about the pack ability that these gain when in a pack of at least 3, the bleed effect attack, now this attack drains 5% of the targets damage over 10 seconds which means using that specific attack, it can 20 shot any enemy. Using an Allosauruses bleed against a Giga or a Titan will significantly damage it but it would be best to use the Allos as the main damage while another dino tanks all the damage. Anyways, to further explain the pack bonus, the leader will be the highest level (obviously) and the leader does not only gain new attacks but they receive a 50% damage increase and a 25% damage reduction, so if you have an imprinted pack leader, it gains a total of 55% damage reduction which is an extreme damage reduction. There can also be multiple pack leaders, especially when in multiples of 3. Thanks for reading, I hope you found this helpful and might reconsider your thoughts on the Allos.
Allos stay alone until another allo gets close enough. When an allo finds another allo they will join forces and form a pack. The highest level allo becomes the leader once the pack reaches a size of 3 allos. A pack of allos will always follow each others no matter what. They usually follow the leader, but can follow a different allo if say a player calls over that specific allo to follow him . If they wander too far from each other the bond will be broken and the allos will set off on their own until they find each other again or other allos. Once a pack reaches a certain size the allos will stop accepting other allos in their pack. The same goes for tamed allos. Once they reach the max pack size of 15 and more allos are introduced your original 15 allos and the new allos will form different packs. Hope this helps you understand allosaurus pack behaviors. Thanks for reading.
I found out that Allosauruses gain an attack bonus against large creatures. I found this out because I was using my level 220 Allo to hunt and I targeted a Diplodocus and the damage was meant to be about 125 but instead my Allo was doing about 550 damage. I then made a theory that anything larger than an Allosaurus will take additional damage so I then tested this theory on a Paracertherium and my Allo did additional damage. I can confirm that Paracers and Diplos take additional damage and I think it applies to Brontos aswell because I saw a low level pack of Allos take down a high level Bronto so it would be reasonable to assume that it works. I have never seen ability said anywhere so I thought I should mention it. Theres also a pack ability where if there is at least 3 Allos then they will gain a pack bonus which will give the leader (the highest level of the 3) an additional attack which inflicts a bleed effect. Hope you found this helpful.