Catapult Idea AND THE BEST IDEA YET, DEFENSE TROOP TRAINGING
How about a Catapult which is 3 by 3 square and flings gaint rock that kill all it crushes. It shoots extremely slowly however, and costs 10,000,000 gold. It can shoot up to 5 rocks and each shot costs 50,000 gold.
BUILDING - - - - - VILLAGE GUARD FORT
You can send up to 5 warrior here. You cannot sent them back! Once send, you cannot you them for attacking. Instead, when enemies come near, they go out to protect the base, not unlike a clan castle holds troops.
Lev 1: Max troops: 5, can hold warriors
Lev 2: Max troops: 6, can hold warriors and archers
Lev 3: Max troops: 7, can hold the above and giants
Lev 4: Max troops: 8, can hold the above and goblins
Lev 5: Max troops: 10, can hold the above and wall breakers (which would be pointless)
Lev 6: Max troops 12, can hold the above and balloons
Lev 7: Max troops 14, can hold the above and wizards
Lev 8: Max troops 16, can hold the above and healers
Lev 9: Max troops 20, can hold the above and dragons
Lev 10: Max troops 25, can hold he above and P.E.K.KA.