Teleiosaurus and Qwyjibo are scripted to meet up on at Slither Beach every so often and fight. This very rarely happens since both of them are generally defeated about five minutes after they spawn, but they're both sort of neat fights (though they haven't kept up with the general power level of players), and it's something nowadays most people don't get a chance to do.
So, turn it into a rampage. To give an excuse to care, move the fight to B17, and make the buildings destructible; the players lose if B17 is destroyed (the map, however, should be large enough that they can be pulled away). To make it a challenge, give them both double damage.
Note that they can hurt one another, which may make two cosmics worth of hit points less tedious, though they both use enough AoE spam that you might prefer to keep them separated.
Incidentally, this no longer works, but Teleiosaurus used to have no leashing radius, which led do
this.
Comments
Epic Stronghold
Block timing explained
Epic Stronghold
Block timing explained
The proposed idea is fun, but some way to equalize teleio's damage with qwyjibo would be needed. Cosmics need an overhaul, anyways.
Epic Stronghold
Block timing explained