It's natural that you will lose RuneScape gold a few times before can complete your first kill. If you die you'll be able to receive your lost items for the price of 100k gold. So, now that we have this covered, let's begin to look at specifications.
Requirements:
To kill Alchemical Hydra It is not necessary to need any quests completed which is not true for such bosses as Zulrah and Vorkath. You will however need to be on slayer duty which will require an Slayer Level of 95.
Since you'll be fighting Hydra in the Karuulm slayer dungeon, you're required to wear boots of stone which you can purchase by any master slayer. If you can afford it, you can swap these boots for boots of brimstone or granite boots. You can also complete high-end Kourend & Kebos diary achievements that can turn your feet into stone. This is a joke This achievement lets you guard your feet against electrical harm in the Karuulm Dungeon so have a look.
Combat Requirements: There are no specific requirements, however, it is recommended to have prayers, hit points, ranged and defence levels. This can help increase the number of kills per hour, forgive some mistakes and extend your trips. Thus, I would recommend that you have at least these stats:
85+ The range
90+ Hitpoints
90+ Defence
80+ Prayer
Gear set-up:
Below are 3 different gear configurations. There is no requirement to wear identical armors, but it's important to provide affordable gear choices for everyone.
Gear setup 1.
This setup will cost you 6M Oldschool gold. It's not possible to get exceptional results from this configuration, but it's going to be affordable for everyone. If you're short, buy some gold at rsorder at the most affordable prices 24/7!
Items on Buy OSRS gold the list: