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My understanding is that teams can send over an invader when the score is at 25/50/75.

I don't understand how often it can happen once a team is fighting the Primeval, though. What are the rules then?

I played a match this morning and it seemed like the enemy team just kept sending players over when we were fighting our Primeval.

I’m not positive, but I believe it’s on a timer. Alternatively, it could be tied to the primevil’s health bar. Either way, it is certainly frequent. You can safely assume your team will be invaded at least 3-4 times while fighting the primeval, in my experience.

Invaders can come when to your side (a) once, when they bank 25+ motes, (b) once more when they bank 50+ motes, and (c) over and over again once you've summoned your Primeval (subject to a 10? 15? 20? second cooldown between when an invader returns and another one can go).

Other rules of note: the invader has 30 seconds to invade, or four kills, whichever happens first. Any kills the invader gets on your team during the Primeval phase heal your Primeval. Deaths by non-invaders do not heal your Primeval - only invader kills do.

I have seen a team go from having their Primeval half dead to him being fully healed by an invader wiping all four of the team.

Also note that the wizards that spawn with the Primeval give the Primeval some damage resistance. It is not necessary to kill the wizards, but if you do kill them both, you will do much more dps on the Primeval.