if the village that you are raiding, have a tons of tomb stones outside, drop the spell onto the tomb stone and random troops will spawn with 1/4 of their health regenerated. the more you upgrade the spell, the better troops will be regenerated. 1 tombstone is 1 troop.
Lv.1------- cost: 30,000k elixir troops
spawn from tombstone: barbs, archers, goblins,
Lv.2------- cost: 35,000k elixir
spawn from tombstone: Lv.1 spell troops, wall breakers and giants
Lv.3------- cost: 40,000k elixir
spawn from tombstone: Lv.1 & 2 spell troops, wizards, balloons
Lv.4------- cost: 50,000k elixir
spawn from tombstone: Lv.1 2 & 3 spell troops, healers ,dragon
Lv.5------- cost: 55,000k elixir
spawn from tombstone: Lv. 1 2 3 & 4 spell troops, P.E.K.K.A s and any random dark troop if spawn over a dark tombstone.
upgrading costs:
Lv.1-Lv.2: 5,000,000 elixir Time: 6 days
Lv.2-Lv.3: 6,000,000 elixir Time: 8 days
Lv.3-Lv.4: 7,000,000 elixir Time: 11 days
Lv.4-Lv.5: 8,000,000 elixir Time: 15 days