The phrase "glass cannon" refers to something or someone that has immense power or strength, but is also very fragile or susceptible to damage. Full definition
I keep it heavily fast, but also hard hitting while having that sort of glass cannon style to its format. (thedailygamepad.com)
Later on I decided to go as Battle Master and I became a duel wielding glass cannon that decimated enemies. (nintendotoday.com)
This leads to the typical tanks and glass cannon strategies being the most effective, although usually the grid is a little too big allowing for enemies to move into range of said cannons for an attack is a little too easily. (cultureofgaming.com)