What it makes
The author lists a sword, pickaxe, axe, shovel, hoe, spear and full armor set. An upgrade uses Netherite equipment, a Siftite Ingot and a Siftite Upgrade Smithing Template. The author also says Siftite gear is fire resistant.
Where related pieces appear
The author describes Siftite ore and rare nuggets in abandoned portal loot. Abandoned portals may also contain the upgrade template. Exact chances are author-described and may change; verify your installed version before relying on them.
Mini Rift recovery
The mod adds a death-recovery mechanic: after respawning, a Mini Rift can return lost Siftite equipment. This is part of the community mod and should not be expected in vanilla Minecraft.