Beast in the Swamp now down in both my and @Brave’s playthroughs. Was tough last night as @Brave has a stronger character so strength set on that basis. I’m sure they make your first run at a boss easier somehow as it always seems a lot more feasible at that point before the next 20 odd runs end in abject failure. 😃. Got a decent strategy helped by mod from previous boss in the end.
I went back to my world and gave the heart to the insect queen rather than scary temple bloke in the other world. I still need to go back to be admonished by him though. The queen gives you a natty looking hunter outfit and a crossbow (empty mod slot). All very highly tuned towards sniper / single shot weapons which need to reload every shot. Big damage boost from the armour. Should be effective against bosses when combined with well developed fast hands trait. Kit she gave is already +8 but would have been good to have it set to your current gear level.