I couldn't finish 'em. Looks like this's gonna get complicated.
The Thunder Bomb is an enemy from Final Fantasy Crystal Chronicles: Echoes of Time. They appear in various dungeons and attack with Thunder Magic. As with all bombs, they will Self-Destruct when angered or felled. They should be dealt with immediately to avoid being constantly inflicted with Paralysis from their Thunder spells and Shock Breath attack.
The Ruins revisit enemy is referred to as Sister Bomb (シスターボム, Shisutā Bomu?) in the Japanese guide
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Etymology
Thunder is the sound caused by lightning. Depending on the distance and nature of the lightning, thunder can range from a sharp, loud crack to a long, low rumble (brontide).
A bomb is an explosive weapon that uses the exothermic reaction of an explosive material to provide an extremely sudden and violent release of energy.