New building

Troop Fusion building. Available staring at th7.
Upgrade to unlock certain troops to fuse. So they share stats.
For example lv.1(th7) barb fused with archer, wizard, or goblin. Lv.1 Barb/arch would have HP(barb) and range(archer). Lv. 3 Barb/ wizard would have flaming sword with extra damage per second.(th9) Lv.2 Barb/gob barb HP and gob speed.(th8)

Just thought of this thought I'd throw it out there, but it sounds a little op to me. What do you think?

Too OP. Combinations between P.E.K.K.A Dragon golem and lava hounds will be too powerfull.

This would be way too OP for a bas to handle, unless you make these merged troops take the housing space of all the troops which it's combined of, in which case they would still need a lot of testing to make sure they are not OP.