Excalibur Blueprint Help/team Strategies?

[LucentsLight]

Well guys, I've been fighting Ambulas for awhile and I was wondering, how rare are the blueprints for Excalibur? I haven't gotten a single one and its about my 12th run through. Any idea?

 

Also with team strategies, I was wondering if anyone has some really good ones. I play with my group of friends and we recently got one going down where we have one person who is a Mag (me) and three Excaliburs. We run with the Energy Siphon artifact and when we get to the boss, I use my bullet attraction, then they go in with radial javelin and after the aftermath, if the boss isn't dead, they take a real nasty hit to their health (the sheilds will be gone with no problem).

 

I wanted to know a little more about other strategies that we could try and see how it works. The more damage/control to kill bosses easily, the better.

[Cleesus]

Its RNG rare

 

 I only ran it twice and got a bp each time.

[alchemistjkt]

rng is rng bro, just keep at it, you will get the BPs eventually.

 

ive seen the mag/excal team thing more than a few times, works rather well honestly. see about getting a trinity to fill in for one excal, dat energy regen.

[AwkwardAlex]

About teams, only thing I can say is Hek. I can easily do kill ambulas by myself with Hek, and the only time I did I've got the last piece of blueprint I was farming for.