Fortis Colosseum - Reinforcements Combat Achievement

Arguably the waves are the hard part but I've seen people struggle with the boss too. Here is how to deal with each of the required handicaps:

Solarflare - Don't step on them. Avoiding tier III will stop them from turning off your prayer during sol's combo attack if you do accidentally step on one. They move around in a set pattern so you can mark the tiles if you believe it will help
Quartet - Pray melee at the start of the wave because the berserker has the highest max hit. Kill whichever spawns whilst dodging the boss then continue killing the boss
Bees - if they are far you can ignore them. If they start coming towards you shoot them only if they are close enough that myopia won't drag you. If they are within 2-tile range be prepared to move because you will get dragged if you attack them as they are moving under you.