The horn

The museum is a 3 floor structure which expands upto 2 acre and is swarming with monsters to the brim

Our currents weapons do not work against them only Dyne can effectively use weapons but his arm his broken so his fighting ability has decreased

Ren has only a broken foot which doesn't affect his ability , Ryan is unconsious in the van , Zee was on standby the whole time so she is unharmed and Elle .... she knows first aid soo that's a good thing .

The problem is the horn . The size of the horn is the size of an fish tank or an entire pool which is 8 feet deep used to jeep sharks and its weight is also a problem . Luckily the horn is on the 3rd floor

It cannot be carried by humans . The only positive point about it is it's durability it has a very hard shell but fhe problem lies that if there is a hole or a large crack in the horn it will fail to summon Tempest

The horn has to be bought outside the museum first as the museum is made to be soundproof inside out

The horn cannot be taken out by normal means

and has to be taken by breaking some of the structure while avoiding the blood demon's rampage

Once it is played it serves no purpose .

So here is the plan . The roof will be blasted and thus be broken and the horn will lifted up and played

Ryan has an heli which is far and he made it himself .Dyne will fend off any monsters in the area . Zee will be responsible for the explosions and Ren he will control the heli remotely

And finally Elle will be .... on standby ofcourse