A Steelsplitter
Steelsplitter is a Blue unit capable to both 
attack and 
defend. It's part of the base set.
Panel
Strategy
Steelsplitter is a versatile unit that can be used either to build pressure or defend with. Steelsplitter is less efficient than other basic set units at both of those tasks though: it costs 1
more than a Wall and doesn't have 
Prompt, and 2 more than a Tarsier for the same attack. As a consequence it is usually incorrect to plan on having Steelsplitters as your main attackers unless the random set contains other units synergizing with them.
The first player to build a Blastforge in the early game will often have the opportunity build a Steelsplitter to put early pressure, forcing their opponent to respond with a prompt defender to avoid losing an Engineer. Here is an example early game illustrating this:
- Player 1: DD, Player 2:DD
- DD, DDC
- DDB, DDB
- DDS, DDW
Buying a Steelsplitter in this context is justified due to its versatility: it efficiently puts immediate pressure, and it will be able to help in defense if your opponent suddenly threatens a lot of damage (through Antima Comet for example). Again, later in the game, buying Steelsplitter simply for additional pressure is not the most efficient, but if the choice is between that and wasting 
blue, it is sometimes best.
Steelsplitter works very well with certain other units. Odin produces three of them and can sacrifice them for attack power, and Steelforges can efficiently convert your Drones into Steelsplitters.
With 
3 Health, Steelsplitter is not as breach-resilient as Gauss Cannon, but still way better than Tarsier and and most red attackers, making it a decent buy if a breach is imminent.
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