So, here is a different take on roguelike bionicle-themed rpg. I added some mechanics that might remind you of Skyrim and tried to make Toa more Toa. Classes don't fit very well with Bioncle. I am not happy with introduction lore, it sounds like if Toa were bad guys mindlessly killing Makuta.
Realm of Teridax v.2
All places, where Makuta species were living are now cleared and populated with Matoran. A lot of Toa were left there to guard them. Teridax and his closest allies had to move to the last island not cotrolled by Toa. He lost many of his minions. but lucky for him, island was dangerous itself before he came, with Bohrok and Rahi wandering it freely. Adding his remaining minions, he is safe from Toa in his realm. At least he was until Toa found his island thousands of years later.
All places where the Makuta were living are now cleared and populated with Matoran. Numerous Toa were left to guard them. Teridax and his remaining allies were forced to move to the last island not controlled by the Toa. He lost many of his minions, but lucky for him the island was already populated with Bohrok and Rahi; they easily fell under his control. On this new island, he is safe from the Toa. At least he was until the Toa found where the last Makuta reigned. Just a little cleaned up.
The Realm of Teridax is a huge island surounded by ocean from all sides. On its shores, new Toa are appearing, ready to finally defeat Teridax. Island itself has many different areas, including forest, plains, desert and finally mountains in the middle of the island. Closer to the mountains, tougher the enemies and land.
One of two places where Toa may appear. Extending up to north and south, it is largest sandy beach on whole island and hosts mostly weak Rahi. Should be ideal for new Toa to adapt to island's hostile nature and get basic loot.
Hosting mostly Vahki and Rahkshi at night, this place is tougher than beach, but still quite manageable for weaker Toa.
Tougher than plains, this place hosts Rahkshi but also swarms of Bohrok. Covered in darkness by treetops, you can meet groups of Rahkshi even when it's day.
Second place where Toa may spawn, terrain is more hostile here than on its east counterpart. Rather than sandy beach, this place is full of cliffs and rocks. Again, it's home mostly to some weaker Rahi.
Mostly same as east plains. (to be extended)
Mostly same as east forest. (to be extended)
Covering most of west side of the island, great desert is a place hosting many hostile species. (to be named)
This place have slightly tougher enemies than both east and west plains. It is still safest way to get from west side to east side and back.
Colder and tougher, this place surrounds mountains. Hosting harder enemies, this place is to be feared by novices. It is a land similar to desert, but with some sparse vegetation.
This place is full of Dark Hunters, guarded by most elite Rahkshi and home to some Makuta, such as Icarax and Antroz. (we don't care much about canon here). Deep in the mountains, there is a staircase to Teridax's underground base.
Might be good to have a map, given the vast amount of locations. It would really help to prevent the characters from being confused.
World was in peace for a long time as Makuta's presence on this island was just discovered. Best Toa were left to defend Matoran in case of sudden attack.
Most of the Toa on island didn't even got a chance to experience real battle. They didn't even had reason to really train. And so, they know basics of fight but still have to gain some skill.
As a Toa, you may prefer different things: swords, daggers, bows or just your elemental powers. Or you can learn to create tools for your allies. More skilled in one ability, the more you are able to use it. But it also slows down increasing skill in different abilities. This phenomenon is called 'leveling'.
Every use of ability gives increases your skill a bit (To be added how does the bit actually look like). Main categories are:
Light attack - Works with weapons such as daggers and short swords. Also let you dual wield mentioned weapons better.
Heavy attack - Warhammers, axes, two-handed swords. These are just some of heavy weapons.
Block - Using shields in combination with light weapons or using heavier to block and eventually perry attacks.
Ranged attack - Using bows, crossbows and another ranged weapons.
Elemental powers - Can be used with any types of weapons to enhance them or at its own as forms of energy.
Craftsmanship - Working with softer materials, such as leather or wood. Better craftsmen can use their elemental energy to improve their products.
Forging - Working with metals and gems. Better craftsmen can use their elemental energy to enhance their products. Requires specialized tools.
Traps laying - Most silent way to kill, hurt or cripple somebody. Start with simple rope and end with sophisticated trap.
Stealth - Great to combine with light weapons or traps laying. If you are good in stealth, you're almost invisible.
How do we decide how good we are though? Some players can RP a fight better, some a stealth better, than what their level would actually reflect? Would this take a LOT of GM interference to control?
All Toa got elemental powers. They can be channeled using weapons, giving your weapon temporary fire effect for example. You can unleash elemental powers themselves, to create water, to lift objects using gravity etc. If Toa of fire with very strong elemental powers ability creates a bow, even Toa of different element will be able to shoot fire arrows. If you use elemental powers often, you will increase your skill eventually.
Toa of Fire can create a bow, but all Toa can use it? Or did I read that wrong?
You get basic stuff. Enemies may have stronger tools and weapons, stronger the enemy, better may weapons be. You will also find materials, which can be crafted or forged into better tools. Using stronger materials however needs more skill. Not everybody can be craftsman.
What kind of basic stuff? Disc launcher? Protosteel swords?
Weaker enemies are controlled by players who are fighting them (with some common sense). They can drop some less powerful gear, but that also depends on location (wasteland enemy will drop better sword than a rahi on beach).
Is there a list of things each enemy can drop? Some players might abuse the system to get "better gear" early on.
At least once per week, a more powerful species of Makuta will appear - an Event. Due to monotony of game, they are probably going to attract players. These can be Bahrag, legion of Rahkshi... They are always announced telepathically by Teridax himself and can be less powerful in plains or pure terror in wastelands. Those are controlled by GMs and can kill you if you underestimate them. Rewards for those tougher guys are more powerful gear and crazy amount of experience.
More powerful species of Makuta? I'm not well versed, but Makuta is already a species. You could say that Teridax(The last Makuta) unleashes a powerful enemy on the island.
Some enemies will guard entrances to dungeons. Those host amounts of bad guys and also bosses on end. If you are alone, don't dare to enter these. (To be added)