This setup makes Botania Mana using Lava with Thermalilys. It's great in skyblock like AS2 or SF4 since lava is almost free with ex nihilo, but the same setup works with a lava fabricator if you have the power. This is AS2/1.7.10 but I have a working version in other 1.7 and 1.12 packs. Depending on the pack, you may need to change the fountain, but the rest is mostly Vanilla and Botania. The key feature is the MFR fountain accepts lava piped in and places it, but other packs may need a different lava placer block. Alternatively, a vanilla dispenser deploys lava buckets, but then you have to mess with buckets. I make lava elsewhere and use TE tesseracts to send it to the fountain and an Extra Utilities lava gen to RF power the fountain. You can also send power through the tesseract, or use ender tanks or an EnderIO dimensional Transceiver if your pack has those.

Lava is placed in the center of 8 thermalily. Each thermalily is linked to the mana spreader above it and all 8 of those point to a mana distributor about 10 blocks above the setup. The flowers surround the lava source, so you need at least the 4 cardinal directions to keep lava from spilling and you can add the corner thermalily later. You can use normal flowers on dirt or floating ones, neither will uproot from the lava. 

The jackolanterns in the front make up the timer/pulse extender. I use redstone on a light source like a jackolantern because when the redstone activates, there's no lighting update lag. A Botania Floating Hourglass with 6 Soul Sand sends a pulse through the repeater every 6 minutes. That signal goes through the 4 comparators, which make a pulse extender, and on the back side on the end is a redstone torch feeding a signal into the fountain.  What this does is once every 6 minutes, for a few seconds, the redstone torch goes out, which enables the fountain, which deploys lava. In between, the thermalillys are on 5min cooldown with the other minute covering consumption time and server lag.

There's a mana pool and an extra spreader on the back left side, this shuts off the lava when mana is full. How it works is the thermalily in that corner is linked to the bottom spreader, which points to the pool, which feeds the back left spreader. If the pools above are full, mana will back up and the comparator will send out a signal, which goes left 3 blocks, inverts with the redstone torch, goes right 2 blocks (the stone bricks keep the top and bottom rows of redstone isolated) and inverts again with the 2nd torch. Since the timer signal goes to a torch and the fullness signal goes to a torch, they act like an AND gate so mana has to be not full AND the timer has to pulse for lava to be fed to the thermalilys.

I use potency lenses for more mana, but you can skip those. You can also use normal mana spreaders and/or less than 8, but they will be a bottleneck. If you are resource limited, I suggest setting this up with a few mana spreaders and at least 4 thermalily surrounding the lava source. Once it's running, you can use the mana to make more thermalilys and some elven mana spreaders.

Here's another shot of the same setup. You can see the Tesseract, which pushes lava and power into the MFR fountain. You can also see the 2 redstone torches from the timer and fullness circuits come together and feed the redstone line that goes into the fountain. Remember, redstone on disables the fountain.

And here's another version from Skyfactory 2.5, which is mostly the same but here I'm using an endertank to send lava and a magma dynamo to power the fountain.

Finally, here's the setup in Stoneblock 2. Here, I use a cyclic fluid placer, which works with a redstone signal instead of disabled with it, so the circuit is different. The fullness check goes to a repeater into the side of the timer repeater so it will "signal lock" aka disable that repeater if mana is full. Instead of a vanilla pulse extender, there's a ProjectRed State Cell set to 2 seconds, which does the same thing. The cyclic placer doesn't need power, so there's just an endertank feeding it lava from below (barely visible in this shot.)